650 TWIN PISTONS 1959 ZGPM726A ! STD bore 72mm Compression height 42,3mm Compression 7,5:1

500CC TWIN PISTONS LATE TYPE 020 ZGPM6612a ! Compression height 37.7mm Only size available 020.

500cc TWIN PISTONS EARLY TYPE ZGPM674D ! Compression height 38mm. STD bore 65.98mm Weight each cpl. 384gr. Price for a pair