Chevy/GMC Black steel rear differential cover with 14 bolt pattern. Fits 14 bolt Chevy/GMC trucks with 9-1/2" ring gear. HZ-9292 differential cover fits: 1973-87 Chevy/GMC 3/4 Ton & 1 Ton Truck 2WD - Rear. 1981-UP Chevy/GMC Truck with 9.5" Ring Gear - Rear. Note: Due to variety of options, we are unable to determine the correct cover for your specific vehicle. Please contact your local dealer for assistance in obtaining the correct fitment information for your vehicle.