Clutch hub deep 4mm spline, as used since 1989 big twin 5 speeds

GU30081810 Commonly refered to as clutch hub, transmission input gear, clutch center, clutch gear, etc. This is the deep 4mm spline version as used by Guzzi since 1989 on all big twin 5 speed transmissions when mated to twin plate clutches.  Original to California III after engine number VT032541, MilleGT after VT 024595, LeMans V after VV016374, SP III, Strada, 1000S, Quota 1000, Daytona 1000, late 850T5 versions, 1100 Sport carb, 1100 Sport injected, Centauro, Daytona RS, California 1100, EV, EV Touring, Jackal, Bassa, California Special, Special Sport, Aluminum, Titanium, Metal, California Stone, Stone Touring, Vintage, QuotaES 1100. Common update for earlier 5 speed transmissions, deeper splines have more surface area reducing wear. Replacement for Guzzi shallow spline clutch kit 29999350 and shallow spline hub 14081811, but requires appropriate deep spline clutch plates to match. Suitable clutch friction plates are part numbers 30084410SD or 30084411.