Hey guys. I have a 1998 yz400f and it has a slight leak from the weep hole when I rev the engine. I have searched and have come to the conclusion that I need to replace the impeller shaft and two seals. My question is are these the same parts from a 2003 yz450f. The reason I ask is that in the OEM thumpertalk store, the oldest bike they list is the 2003. Thanks guys!