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Freightliner M2 Business Class Parts

The Freightliner M2 Business Class semi-truck is a solid medium-duty truck that offers the versatility and reliability you'd expect from Freightliner, but we can make you stand out even more by customizing your semi truck with quality parts and chrome accessories from 4 State Trucks. When you drive an M2 Business Class, you'll enjoy top-notch features like maneuverability, roomy interior, and great driver visibility that make it fun and easy to keep your truck on the road. Whether you need bumpers, exhaust, fuel tanks, or any other aftermarket or custom parts for your M2, 4 State Trucks has got you covered - shop our selection of Freightliner parts today.
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  • Quantity
  • Price
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  • BESTfit DEF Sensor Head Assembly Replaces 2515990C3, 601965, 5511564

    BESTfit DEF Sensor Head Assembly Replaces 2515990C3, 601965, 5511564

    BESTFIT TRUCK PARTS

    $1,065.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 2515990C3, 601965, 5511564Trust the BESTfit DEF Sensor Head Assembly to restore proper emissions monitoring. This high-quality component...
    29-06070033
    SKU:
    29-06070033
    Product Type:
    Fuel Tanks
    Height Options:
    11 1/2 Inch
    Make:
    Universal Items
    $1,065.99
    Qty in Cart: 0
    Price:
    $1,065.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces AP65151, 5511561, GA111561

    BESTfit DEF Sensor Head Assembly Replaces AP65151, 5511561, GA111561

    BESTFIT TRUCK PARTS

    $1,572.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces AP65151, 5511561, GA111561Restore accuracy to your DEF system with the BESTfit DEF Sensor Head Assembly. Engineered for CAT C4.4-style...
    29-06070035
    SKU:
    29-06070035
    Product Type:
    Fuel Tanks
    Height Options:
    22 Inch
    Make:
    Universal Items
    $1,572.99
    Qty in Cart: 0
    Price:
    $1,572.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 3329295, 4812011099, 501740

    BESTfit DEF Sensor Head Assembly Replaces 3329295, 4812011099, 501740

    BESTFIT TRUCK PARTS

    $1,345.99
    Diesel Exhuast Fluid Sensor Head Assembly By BESTfit Replaces 3329295, 4812011099, 501740Maintain peak emissions system performance with the BESTfit DEF Sensor Head Assembly. Designed for Diesel...
    29-06070038
    SKU:
    29-06070038
    Height Options:
    18 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,345.99
    Qty in Cart: 0
    Price:
    $1,345.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins & Caterpillar Replaces 098644D204, 4387305, 5EL058

    BESTfit DEF Pump 2.2 For Cummins & Caterpillar Replaces 098644D204, 4387305, 5EL058

    BESTFIT TRUCK PARTS

    $1,145.99
    Diesel Exhaust Fluid Pump 2.2 By BESTfit Replaces 098644D204, 4387305, 5EL058 Fits Cummins & CaterpillarUpgrade your emissions system with the BESTfit DEF Pump 2.2, a premium replacement for part...
    29-06070024
    SKU:
    29-06070024
    Product Type:
    Exhaust
    Style Options:
    Cummins
    Make:
    Universal Items
    $1,145.99
    Qty in Cart: 0
    Price:
    $1,145.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins Replaces 1819797, 2880158, A662102

    BESTfit DEF Pump 2.2 For Cummins Replaces 1819797, 2880158, A662102

    BESTFIT TRUCK PARTS

    $1,145.99
    Exhaust Fluid Pump 2.2 By BESTfit Replaces 1819797, 2880158, A662102 Fits CumminsOptimize your emissions system with the BESTfit DEF Pump 2.2, a dependable replacement for 1819797, 2880158, and...
    29-06070029
    SKU:
    29-06070029
    Product Type:
    Fuel Tanks
    Style Options:
    Cummins
    Make:
    Universal Items
    $1,145.99
    Qty in Cart: 0
    Price:
    $1,145.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 4623219, 82196511, T434824

    BESTfit DEF Sensor Head Assembly Replaces 4623219, 82196511, T434824

    BESTFIT TRUCK PARTS

    $891.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitStrengthen emissions system reliability with the BESTfit DEF Sensor Head Assembly, a high-quality replacement for 4623219, 82196511, and T434824...
    29-06070031
    SKU:
    29-06070031
    Product Type:
    Fuel Tanks
    Height Options:
    11 Inch
    Make:
    Universal Items
    $891.99
    Qty in Cart: 0
    Price:
    $891.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 82217519, 918161618, APP41422

    BESTfit DEF Sensor Head Assembly Replaces 82217519, 918161618, APP41422

    BESTFIT TRUCK PARTS

    $1,057.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 82217519, 918161618, APP41422Count on accurate DEF monitoring with the BESTfit DEF Sensor Head Assembly, replacing 82217519, 918161618,...
    29-06070034
    SKU:
    29-06070034
    Height Options:
    18 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,057.99
    Qty in Cart: 0
    Price:
    $1,057.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 3600932, 5913429, 714898

    BESTfit DEF Sensor Head Assembly Replaces 3600932, 5913429, 714898

    BESTFIT TRUCK PARTS

    $887.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitEnsure consistent emissions performance with the BESTfit DEF Sensor Head Assembly. Built for CAT C3.6 and C4.4 engines, this assembly accurately...
    29-06070020
    SKU:
    29-06070020
    Product Type:
    Fuel Tanks
    Height Options:
    18 Inch
    Make:
    Universal Items
    $887.99
    Qty in Cart: 0
    Price:
    $887.99
    Subtotal:
  • BESTfit DEF Fluid Level & Temperature Sensor For Paccar Replaces AP65148, GA617002, 216127002

    BESTfit DEF Fluid Level & Temperature Sensor For Paccar Replaces AP65148, GA617002, 216127002

    BESTFIT TRUCK PARTS

    $286.99
    DEF Fluid Level & Temperature Sensor By BESTfit Replaces AP65148, GA617002, 216127002 Fits PaccarSupport optimal SCR emissions performance with the BESTfit DEF Fluid Level & Temperature Sensor, a...
    29-06070030
    SKU:
    29-06070030
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $286.99
    Qty in Cart: 0
    Price:
    $286.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins Replaces 098644D207, 2P0131113B, 5EL056

    BESTfit DEF Pump 2.2 For Cummins Replaces 098644D207, 2P0131113B, 5EL056

    BESTFIT TRUCK PARTS

    $1,138.99
    Diesel Exhaust Fluid Pump 2.2 By BESTfit Replaces 098644D207, 2P0131113B, 5EL056 Fits CumminsMaximize the efficiency of your emissions system with the BESTfit DEF Pump 2.2, a reliable replacement for...
    29-06070027
    SKU:
    29-06070027
    Style Options:
    Cummins
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,138.99
    Qty in Cart: 0
    Price:
    $1,138.99
    Subtotal:
  • BESTfit Doser Injector Mounting Hardware Kit For Cummins

    BESTfit Doser Injector Mounting Hardware Kit For Cummins

    BESTFIT TRUCK PARTS

    $89.99
    Doser Injector Mounting Hardware Kit By BESTfit Replaces 2120750011, 4376837, NMD4376837 Fits Cummins EngineKeep your doser injector securely mounted with the BESTfit Doser Injector Mounting Hardware...
    29-06070021
    SKU:
    29-06070021
    Product Type:
    Fuel Tanks
    Material Options:
    Stainless Steel
    Style Options:
    Cummins
    Make:
    Universal Items
    $89.99
    Qty in Cart: 0
    Price:
    $89.99
    Subtotal:
  • BESTfit Doser Injector Gasket For Cummins Engine Replaces 4354280, 2885890, A029Y977

    BESTfit Doser Injector Gasket For Cummins Engine Replaces 4354280, 2885890, A029Y977

    BESTFIT TRUCK PARTS

    $50.99
    Doser Injector Gasket Gasket By BESTfit Replaces 4354280, 2885890, A029Y977 Fits Cummins EngineMaintain proper injector sealing with the BESTfit Doser Injector Gaske for Cummins engines. Constructed...
    29-06070023
    SKU:
    29-06070023
    Product Type:
    Fuel Tanks
    Material Options:
    Stainless Steel
    Style Options:
    Cummins
    Make:
    Universal Items
    $50.99
    Qty in Cart: 0
    Price:
    $50.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 2515991C2, 4378048, 5510447

    BESTfit DEF Sensor Head Assembly Replaces 2515991C2, 4378048, 5510447

    BESTFIT TRUCK PARTS

    $1,160.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitKeep your emissions system running efficiently with the BESTfit DEF Sensor Head Assembly, a direct replacement for part numbers 2515991C2, 4378048,...
    29-06070026
    SKU:
    29-06070026
    Height Options:
    17 1/2 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,160.99
    Qty in Cart: 0
    Price:
    $1,160.99
    Subtotal:
  • BESTfit DEF Doser Injector Kit For Cummins Engine Replaces 2121301002

    BESTfit DEF Doser Injector Kit For Cummins Engine Replaces 2121301002

    BESTFIT TRUCK PARTS

    $131.99
    Diesel Exhuast Fluid Injector Kit By BESTfit Replaces 2121301002 Fits Cummins EngineKeep your DEF system performing reliably with the BESTfit DEF Doser Injector Kit a replacement for Cummins engines...
    29-06070022
    SKU:
    29-06070022
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • BESTfit DEF Fluid Level & Temperature Sensor Replaces 30B1514, 46850454, 621246

    BESTfit DEF Fluid Level & Temperature Sensor Replaces 30B1514, 46850454, 621246

    BESTFIT TRUCK PARTS

    $1,263.99
    Diesel Exhaust Fluid Fluid Level & Temperature Sensor By BESTfitKeep your DEF system functioning properly with the BESTfit DEF Fluid Level & Temperature Sensor, replacing 30B1514, 46850454, and...
    29-06070019
    SKU:
    29-06070019
    Product Type:
    Fuel Tanks
    Height Options:
    18 Inch
    Make:
    Universal Items
    $1,263.99
    Qty in Cart: 0
    Price:
    $1,263.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 077905V01501, 21640012, 46699859

    BESTfit DEF Sensor Head Assembly Replaces 077905V01501, 21640012, 46699859

    BESTFIT TRUCK PARTS

    $887.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitDepend on the BESTfit DEF Sensor Head Assembly for reliable DEF system performance. Designed for CAT C3.6 and C4.4 engines, it monitors diesel...
    29-06070018
    SKU:
    29-06070018
    Product Type:
    Fuel Tanks
    Height Options:
    11 Inch
    Make:
    Universal Items
    $887.99
    Qty in Cart: 0
    Price:
    $887.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Jump Starter 12 Volt 4000A

    Jump Starter 12 Volt 4000A

    AUTOMANN USA

    $157.99
    12 V. 4000A Portable Jump StarterStay ready for unexpected breakdowns with the Jump Starter 12 Volt 4000A, built for heavy-duty truck starting power. This high-performance portable unit is designed...
    09-21010001
    SKU:
    09-21010001
    Product Type:
    Tools
    Make:
    Universal Items
    $157.99
    Qty in Cart: 0
    Price:
    $157.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Jump Starter 12 Volt 3000A

    Jump Starter 12 Volt 3000A

    AUTOMANN USA

    $116.99
    12 V 3000A Portable Jump StarterStay prepared for unexpected breakdowns with the Jump Starter 12 Volt 3000A, built for medium-duty truck use. This portable jump starter delivers reliable 12-volt...
    09-21010002
    SKU:
    09-21010002
    Product Type:
    Tools
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $116.99
    Qty in Cart: 0
    Price:
    $116.99
    Subtotal:
  • FREE SHIPPING
    Lithium-Ion Jump Starter 12/24 Volts

    Lithium-Ion Jump Starter 12/24 Volts

    AUTOMANN USA

    $632.99
    12/24 V. Portable Jump StarterGet back on the road faster with the Lithium-Ion Jump Starter, engineered for heavy-duty commercial and fleet truck use. This high-quality portable jump starter delivers...
    09-21010000
    SKU:
    09-21010000
    Product Type:
    Tools
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $632.99
    Qty in Cart: 0
    Price:
    $632.99
    Subtotal:
  • BESTfit DEF Doser Injector Kit Replaces 043028, 2121300002 For Cummins

    BESTfit DEF Doser Injector Kit Replaces 043028, 2121300002 For Cummins

    BESTFIT TRUCK PARTS

    $131.99
    Diesel Exhaust Fluid Doser Injector Kit By BESTfit Replaces 043028, 2121300002 Fits CumminsKeep emissions systems performing efficiently with the BESTfit DEF Doser Injector Kit, a direct replacement...
    09-06070004
    SKU:
    09-06070004
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • Total: items /

Adding your products to cart

When your Freightliner M2 Business Class is your daily workhorse, you need parts that can keep up. Whether you're hauling, delivering, or running job to job, our aftermarket parts and accessories help your rig stay sharp, strong, and road-ready.

Aftermarket Freightliner M2 Business Accessories

Our aftermarket semi truck parts are reliable, high-quality components—from front bumpers and grilles to lights, mirrors, exhausts, and more. Need engine parts to keep your powertrain smooth? Or custom touches to make your truck stand out? We’ve got it all.

Why Upgrade Your Semi Truck Parts?

- Built for performance: Get durable parts that stand up to heavy-duty jobs. - Boost your style: Chrome accents, lighting upgrades, and custom add-ons. - Fit you can trust: Designed to match the M2’s exact specs for a smooth install. - Versatile options: Perfect for owner-operators, fleets, and vocational trucks.
Whether you’re replacing worn components or tricking out your cab, the right parts make all the difference. Keep your Freightliner M2 Business Class looking great and running strong—mile after mile.

Frequently Asked Questions About Freightliner M2 Business Class Parts

What years and models of Freightliner M2 Business Class trucks do your parts fit?

Our parts are designed to fit Freightliner M2 Business Class trucks from 2003 to present. However, compatibility can vary by specific part type. For bumpers and body panels, there are typically three main design generations: 2003-2007, 2008-2017, and 2018-present. Always check the product description for exact year ranges, or contact our team with your OEM number to ensure proper fitment. Some parts may also fit the M2 106 and M2 112 variants, but verify compatibility before ordering.

Are aftermarket bumpers as durable as OEM parts, and what materials are they made from?

Quality aftermarket bumpers for the M2 Business Class are typically constructed from either heavy-duty steel (16-gauge or thicker) or high-impact ABS plastic, depending on the application. Steel bumpers often feature chrome plating or powder coating for corrosion resistance. While OEM parts meet factory specifications, many aftermarket options actually exceed OEM durability standards, especially those designed for vocational use. Look for bumpers with reinforced mounting brackets and proper drainage holes to prevent rust. We clearly specify material thickness and coating type in each product listing.

What are the most common installation challenges when replacing M2 Business Class bumpers?

The most frequent installation issues include: alignment with existing mounting holes (especially on 2008+ models where hole patterns changed), proper fitment around fog lights and sensors, and weight management during installation (steel bumpers can weigh 80-150 pounds). Many customers report needing to slightly enlarge mounting holes or use washers for proper alignment. We recommend having a second person assist with installation and using a floor jack to support the bumper during mounting. Installation typically takes 2-3 hours with basic tools, though vehicles with air dam systems or integrated step plates may require additional time.

What finish options are available, and which holds up best for different applications?

Common finishes include chrome-plated steel, polished stainless steel, painted steel, and textured plastic. For highway applications, chrome provides the classic look but requires regular maintenance to prevent pitting. Polished stainless steel costs more initially but resists corrosion better in salt-heavy regions. For vocational trucks in construction or waste management, painted steel bumpers with textured powder coating offer the best impact resistance and easy touch-up capability. Plastic bumpers work well for urban delivery trucks where weight savings and minor impact absorption are priorities.

Do I need to order additional hardware or brackets when buying a replacement bumper?

Most replacement bumpers come with new mounting brackets, but rarely include bolts, nuts, or washers. Plan to purchase Grade 8 hardware separately - typically you'll need 8-12 bolts (usually 1/2" or 5/8" diameter) with corresponding lock washers and nuts. Some installations may require bumper-to-frame adapter brackets if switching between bumper styles or upgrading from plastic to steel. Fog light brackets, license plate holders, and step plates are usually sold separately. Check if your existing hardware is reusable, but having new hardware on hand prevents installation delays.


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