ARP Bellhousing To Engine Block Bolt Kit (AR134-0901)LS CHEV GEN 3 BELLHOUSING> fits Gen III LS Series, Black Oxide, Hex Head, M10 x 1. 5, 1. 375" UHL Part Number: AR134 0901 These premium grade bolt and stud kits are engineered to properly engage the engine block threads and resist loosening. They're application specific, and come in your choice of black oxide finished chrome moly or rust proof stainless steel, with handy 12 point or standard hex heads. Washers and nuts included where applicable.