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BSA Type C Piston 63mm +060STD: 63mmPin: 15.8mmnew, old stock
Douglas Piston 500cc 1933-35 O.H.V
Douglas Piston +30 /Pair 600 cc 1927-
Norton Piston NOS 490cc 1931/48 +20
Norton Piston NOS 490cc 1931/48 +020
Norton Piston NOS 1948/54 490 cc +40 16H