marvi- I know that people make them (IRS or Trinity i think...) for oval cars, however i dont think anyone makes them for 12th, nor do i think that they would be the hook up, since they are stiff and springy, although i could be wrong (which is very likely in this case since i dont know alot about t-bar cars, lol). I would still try to stick to a normal t-bar either .062 or .075 (i think those are the normal sizes at least, lol).

IRS makes rx packs for 12th scale, I have also seen them at R/C Madness in CT (www.rdmadness.com) and i am almost 100% sure that they would ship them.