Peterbilt 357/378 Cab & Related

Frequently Asked Questions About Peterbilt 357/378 Cab & Related

What kinds of parts are included in this category?

This category covers cab components and related hardware for Peterbilt 357 and 378 models, including items like cab mounts, cab panels, door parts, cab corners, extenders, air cleaner brackets, and other structural and trim pieces that attach to or support the cab. If you are looking for a specific part, checking the product title and description against your truck's VIN or build sheet is the best way to confirm fit.

How do I know a part will fit my specific Peterbilt 357 or 378?

Peterbilt made running changes to cab designs across model years, so fitment can vary even within the same model line. Always compare the part number, dimensions, and mounting points listed on the product page to your existing part before ordering. If you are unsure, contact our parts team with your truck's year, model, and VIN so we can help confirm compatibility before you buy.

Are these parts OEM or aftermarket, and how does that affect fit and finish?

Our listings include both OEM and quality aftermarket options, and each product page notes which type you are purchasing. OEM parts are built to original Peterbilt specifications for a direct fit, while aftermarket parts are manufactured to match OEM dimensions but may have slight differences in finish, material gauge, or coating. Read the product description carefully to know what you are getting.

What material and finish options are available?

Cab components in this category are typically available in steel, aluminum, or fiberglass depending on the part, and finishes range from raw or primed to painted or powder-coated. If color-matching to your truck matters, look for a paintable or primed option and have it finished by a professional painter to match your exact factory or custom color.

Do I need professional installation, or can these parts be installed at home?

Simpler items like brackets, trim, or small cab hardware can often be installed with basic tools and general mechanical experience. Larger structural pieces, such as cab mounts or cab corner panels, involve more precise fitting and may require welding, alignment, or body work, so we recommend having those installed by a qualified truck body shop or technician to ensure proper fit and safety.