Will these fit?

245/?/15?? You'll need to measure the offset with the adapters included. I'm not 100% sure, but I doubt these will fit. Our Scamps and Darts don't have a lot of room to play in the back. Adding the adapters will push it out from the spring, but may get too close to the wheel well lip. Just take one of his wheels and try mocking it in with some room left to imitate the adapter.

Edit: Now, if you have air shocks.......! :D