Bolt, 5/16in x 2-1/4in x 26tpi, zinc plated. BSCY / CEI with Norton slightly domed head. Original part number: 11304 - Norton Front chainguard engine plate bolt 11304 - Norton Rear frame member pinch bolt (off side) (offside top plunger bolt) 15901 - shock absorber bottom fixing bolt widelein featherbed