Get a measuring tape and crawl under there. Figure out how wide you can go and what diameter will fit. A body cars typically need a short tire unless you make additional mods. You can probably fit a 10 inch wide tire in there but it won't be very tall, maybe 26 or 27 inches at most? The front lip tends to get in the way pretty quickly. Once you know how wide the tire can be then you can figure out which wheel you want. Then you can buy the tire and wheels and put them in place so you can measure the distance between the wheel centers.