Universal rear master cylinder for Derbi Yamaha Pitbike,... Size between fixation screw: 40mm to 50mm. Lenght of the brake push rod: (between superior fixation and pedal axle): 85mm to 165mm (if the size is shorter than 150mm you will need to cut the brake push rod without problem).  

Rear brake pads set for Aprilia RS RX AF1 Malaguti F12 F15 Yamaha DT-R Fantic Oasis Cabalero  Beta TR34. dimension : 31.5 x 57.2 x 5.5 mm by RMS