Hello, I just recently obtained a 1998 Polaris Widetrak lx with a 500cc motor in some rough shape. I am trying to find out what size mikuni carburetor this sled takes, or what a good replacement carb would be for it. I refuse to pay the $480 per carb for a oem polaris. The only thing I know...

The aluminum head is wrotten in my citation so I need to replace it. WOuld I slightly different size head work? Thanks