Hi, I am having trouble finding simple replacement parts for the 450. Even exhaust manifolds that say fits all Losi 5 T's don't fit on the Rovan 450. So I emailed Rovan about their copper exhaust gasket, and they tell me they don't make gaskets for the 450. ??? What am i missing here. Can anyone please help me know where you can find simple Rovan 450 replacement parts for the engine itself. Gaskets, screws etc....