Frequently Asked Questions About Kenworth W900B/W900L Mirrors & Acc.

Will these mirrors fit both W900B and W900L models, and what years are compatible?

Most aftermarket mirrors for W900B and W900L models are interchangeable since both trucks share similar door and mounting configurations. These mirrors typically fit models from 1987 through current production years. However, there are some differences: pre-1994 models may require different mounting brackets, and some heated or motorized options need specific wiring harnesses based on your truck's electrical system. Always verify your specific model year and door type (standard vs. extended) before ordering.

What's the difference between chrome plastic and stainless steel mirror options?

Stainless steel mirrors offer superior durability and maintain their shine longer, especially in harsh weather conditions and road salt exposure. They're heavier but won't pit or peel like chrome-plated plastic. Chrome plastic mirrors are more affordable and lighter, making door adjustment easier, but may show wear after 2-3 years of heavy use. For trucks in northern climates or those frequently washed, stainless steel is worth the extra investment. Chrome plastic works well for show trucks or moderate-use applications.

Do I need special tools or brackets to install replacement mirrors?

Basic installation requires standard hand tools: socket set (typically 13mm-17mm), Phillips and flathead screwdrivers, and possibly a drill for new mounting holes. Most direct replacement mirrors use existing mounting points and include necessary hardware. However, upgrading from manual to heated/motorized mirrors requires running new wiring through the door, which may need wire fishing tools and electrical connectors. West Coast style mirrors often need different brackets than stock mirrors, which are usually sold separately.

How do heated and motorized mirror options connect to my truck's electrical system?

Heated mirrors typically require a 12V power source and ground connection, often tapped from the door's existing wiring harness. Motorized mirrors need additional wiring for the control switches, which mount in the door panel or dash. Many W900L models from 2000 onward have pre-wired connections in the doors for these features, while older trucks require running new wires from the fuse box. Complete wiring kits with detailed diagrams are available for trucks without factory preparations.

What size mirror heads provide the best visibility for different driving conditions?

Standard 7x16 inch flat mirrors work well for highway driving and general use. For better blind spot coverage, especially when pulling wide loads or in city driving, 8x19 inch convex mirrors or combination flat/convex units are recommended. Hood-mounted mirrors should be at least 6 inches in diameter for effective forward visibility. Many drivers prefer the West Coast style with larger mirror heads (8x19 or bigger) for maximum coverage, though these create more wind resistance and may vibrate more at highway speeds.