Honda CBX1000 Front Brake Master Cylinder Rebuild Kit - Z model .Tourmax quality aftermarket front brake master cylinder rebuild kit. Part Number MSR 105. With this kit, we supply an essential replacement EDPM O ring for the reservoir free of charge which no other aftermarket kit supplies.
OE part number for the O ring 45516422006 valued at £7.50 or $9 USD
Ther rear master cylinder rebuild kit can be found here.