Solid GM Corporate 14 Bolt (10.5" Only)Heavy Duty Differential Cover Product Details: Features Lifetime warranty Thick nodular iron casting with reinforcing ribs. Fully machined seal surface. Machined bolt bosses for maximum clamping force. Benefits Adds rigidity to weak factory housings Replaces weak factory stamped steel covers. Dense material quiets down noisy lockers. Includes Heavy duty powder coated cover. Zinc plated hardware No Fill plug in Cover, Use Stock fill hole. Silicone sealant If you need Metric hardware, please let us know when ordering. This cover WILL NOT fit the Corp. 9.5" 14 Bolt nor the AAM 10.5" or AAM 11.5", 14 bolt rear diffs. Please verify which Diff you have before ordering. If you have any questions, please ask, we are happy to help. *** Cannot be used on or with a shaved "13 bolt" diff. Doing so will VOID any warranty on this product***