Rear brake rotors

[nascarnutt]

Hello all, I'm new to this site and lookin for some information. I just bought a fixer upper from a friend of mine. Ot's a 92 Venture, so far I have replaced the vacuum lines to the cruise, carb boots which connect the carbs to the heads, repair the connections to the suspension controller(E4 error). Next on my list is to replace the rear brake rotor. It seems to be warped. When applying the brakes there is a definite shudder and the front rotors look fine. My question is what other bikes use the same rotor, are some of the front rotors the same as the rears? I have been searching ebay and there are a few out there. I am on a limited budget and looking for a deal.