123mm centre to centre (the 550 in 2001-2002 was 124mm C-to-C) Taffmeisters has done it again we have had these rods made, a Con Rod to fit your 501 or 550, 2001-2008 mod...
Wossner complete Piston , 100 mm Bore, c/w rings and pin. We highly recommend this piston, it is 1mm lower on the crown than the OEM/FACTORY piston . Ideal for your 4...