Front master cylinder PS 15 round, black (without lever)
Brembo 15mm Master Cylinder Repair Service Kit for Ducati, KTM, PS15 - 110273920 | eBay
17659350 - $22.82 - 15mm Brembo master cylinder kit round front most rear to 2010 [17659350] : MG Cycle, Moto Guzzi Parts and Accessories available online at MGCycle.com