Wingsmoto Front Right Brake Master Cylinder For GN125 GS125 GSX125 GN250 GS250 GZ250 GS425 GS450 Oil Bolt Size: 10mm Mirror Mounting Size:10mm Right Hand Thread Fitting:GN125 GS125 GSX125 GN250 GS250 GZ250 GS425 GS450 Please Read The Size on The Second Pictures and Confirm It Is Same As Your Old one !