I have a 05 wr450 with a cracked left side crankcase cover. It's the side with the starter and stator. Any won know if one off a 04 YFZ will fit. The first 3 leters of the part # are different. (The YFZ is 5TG, and the WR is 5TJ) But by apperance the only differance is that their is a crankcase vent tube above the starter gear on YFZ. Any help or advise would be appreciated.