This Premium Duramax/Cummins Rear Differential Cover Bolt Kit is an optional upgrade for our Diff Covers. Comprised of 12 specially selected high strength Stainless Steel 12-point ARP fasteners and matched washers for use with WCFab Duramax/Cummins AAM 11.5" Rear Differential Covers (WCF100113) and 2020-2024 GM 2500/3500HD & 2019-2022 Ram 2500/3500 Rear Differential Covers (WCF100114). Replaces the Socket Head Cap Screws and washers supplied with our kits standard to help put the finishing touch on your build.