Fuel Cap Kenworth T600,T660, T700, T800 & W900 5.5 Custom Threaded Nec
Amazon.com: Fuel Cap for Kenworth Trucks - Locking, Solid : Automotive
Amazon.com: Locking Diesel Fuel Cap Compatible with Freightliner Kenworth Western Star Fuel Caps,3 1/2" Course Thread 5.5 TPI Vented Semi Truck Fuel Tank Cap with 2 Keys : Automotive