Try this CGM. Very, very cheap. I've seen this car and it's in pretty cherry condition . The guy that races it is in the expert class @ my LHS. Which basically means, its well taken care for.
Yokomo CGM Roller
With the price his asking for, you can't go wrong. I've had the SD and I coverted it over to the RAYSPEED and to be honest with you, there was no difference (the RAYSPEED only LOOKS prettier). Tek Nickal has a good point, your going to spend well over $450 buy getting a Yok kit and doing all of those conversion. You minus well get the "555" . But try the CGM, I think you'll be very happy with it.