Try downloading the parts list for both cars and see what parts are the same...
Still not sure if they make the sprint2 still, but you would find it easier to get parts for the 2 since its newer
Other option is get a cheap second car. I cant imagine a used one being too expensive if someone wants to sell it bad enough
If your going to be racing (On a track) you might want to consider something a little better suited. This car would make a fine basher, but not such a great race car.