Fits Heavy Duty HEMI MDS Engine.; Regular Cab; 8 Foot Bed; 8-Spd Auto 8HP75-LCV Trans.; Med. Duty 2WDor Heavy Duty HEMI MDS Engine.; Crew Cab; 6'4" Box; 8-Spd Auto 8HP75-LCV Trans.; Med. Duty 2WDor Heavy Duty HEMI MDS Engine.; Crew Cab; 8' Box; 8-Spd Auto 8HP75-LCV Trans.; Med. Duty 2WD