Try the Kyosho thread.
Kyosho Touring Car
Not alot of companys even sell stuff for the K car here in states and there very pricey so thus hardly anyone uses them. Also theres a newer car out, the TF-6 which I hear is good but again not alot support for it here state side.
BTW the 200mm GT cars that your reffering too are very cool. No class though for them around here. Kinda anitch thing I guess