Fits Rear; Exc. Auto Level Rear Air Suspension; Regular Cab; 8 Foot Bed; Med. Duty 2WDor Rear; Exc. Auto Level Rear Air Suspension; Crew Cab; 6'4" Box; Med. Duty 2WDor Rear; Exc. Auto Level Rear Air Suspension; Crew Cab; 8' Box; Med. Duty 2WDor Rear; Exc. Auto Level Rear Air Suspension; Mega Cab