Well, here's the deal, I really don't think they used different A-arms/control arms for the CTR (so the bushings should be the same there). Also, if you are looking at doing the motor mount bushings they should be the same as well as the mounts and mount points are all the same. The only thing that would really differ, suspension wise, between the Si and the CTR would be the spring/damper rates as the CTR was tuned for racing.