Bolt and washer, 1/4 in 9/16 in long x 20tpi flat head, Norton alloy head rocker shaft plates retainer, set of 8, stainless steel [head is 7/16inch AF]. Original part number K12/949; T225; 6067583; 06-7583 - rocker shaft fixing plate bolt x 8 D12/948; T2240 - rocker shaft fixing plate washer x 8