what size SBP wheels can we fit under a rear 1963 fender?

15x7 with a 4 1/2" back space. No modifications. Pics of your coil overs?
ill grab a picture of them next time i see the car, it is sitting at my parents house in the valley. don't want the salt air to get to it down here near the beach.
i remember they were just something cheap coil overs, can't remember exactly the brand.