I found a few pics online:

There's a Bezrodny 3D print design on Cults that's so-so but probably good enough for a stock car, and it has the correct back glass design. If one can print it themselves, it would be much cheaper than a Too Many Projects body (which I've found to be great but hugely expensive at least to get into Canada), but even finding somebody to print the body would still probably be quite a bit cheaper.