Fits Cummins Engine.; Engine Block Heater; Regular Cab; 8 Foot Bed; Med. Duty 2WDor Cummins Engine.; Engine Block Heater; Crew Cab; 6'4" Box; Med. Duty 2WDor Cummins Engine.; Engine Block Heater; Crew Cab; 8' Box; Med. Duty 2WDor Cummins Engine.; Engine Block Heater; Mega Cab