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
572.1042 | Fuel Cap | 3 Inch
Kenworth, 3-3/8" ID 5-1/2 Threads Per Inch, Locking Fuel Cap
8125-02 | Fuel Cap Kit, 3", Kenworth | Fleetsworld