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Bolt, 5/16in x 1-3/8in x 26tpi, zinc plated. BSCY / CEI with slightly domed head, Norton AJS Matchless Triumph style pre 1960s. Taller head than 13870, crankcase joint bolt.Original part number:000367; 21906; 067632 - kick starter clinch bolt; exhaust pipe bolts; zener diode bolt; tank fixing bolt