Bolt, nut, washer for crankcase joining for Norton singles and twins, each ZP, with special reduced, flat head. Twins use 1, singles use 3.Original part number:13870; 06-7632; 067632 - crankcase bolt, short (single)E3223; A2/5; D12/314; H12/314; B4/667; E2/996 - nutE5456 - washer