Chevy/GMC truck rear differential cover with 12 bolt pattern. Fits 12 bolt Chevy/GMC truck rear ends with 8-3/4" ring gear. HZ-9070 differential cover fits: 1962-82 Chevy/GMC 1/2 Ton 2WD/4WD (Only) - Rear. 1967-81 Chevy Blazer 1/2 Ton Full-Size 2WD/4WD - Rear. 1967-81 GMC Jimmy 1/2 Ton Full-Size 2WD/4WD - 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.