Tankmech4

I'm not a complete newb to rc cars, but it has been quite a few years since I worked with them. My wife, wanted a hobby we could share, gotta love a woman like that, and ok'd buying 2 thunder tiger Ts4e's. I'm want to get them competitive for when we/she is ready for racing. I'm having trouble locating those parts. Can anyone tell me if anyone is manufacturing them, and if so whom? I'm looking for the higher quality and better built suspension parts, drive train's, etc. thanks in advance.