These are a set of Yamaha SX 700 case halves that came from Bender Racing , they are Prototypes and will fit any of the Redhead non power valve 3 cyl motors ! Have a serial # of 00008 which is really cool if your a Yamaha collector ! They are in great condition ! Own a part of history , Yamaha's first 3 cyl snowmobile motor prototype factory parts !