This rear disc brake is used on all Hammerhead 150s and 250s, and Trailmaster 150s and 300s. Works with most 150cc and 250cc buggies, Regardless of vehicle brand. Has a mounting hole for models with a speedometer magnet, but can be used without a speedometer. 220mm diameter (8-5/8"); 4.5mm thick. Center hole diameter 58mm (2-5/16") 4 Bolt Pattern is 3-5/32" . Rear brake disc Old TJ Power Sports Part # 8.010.053. American SportWorks Part # 14202.Trailmaster Part # 8.010.053, 8010053250G000.