for best results, the tires would need to come off...or at least let all the air out and push down on the tire to un-seat the bead. it is possible to paint them with the tire, but its like painting a door without removing the handle, mirror, and mouldings, just poor workmanship. i think you can get powder coating in different finishes, but i think that the tire would have to be removed for that. i dont see a way around it for this. you could drop the mustang off at the body shop and let them deal with removing the wheels and it sitting around for a few days....or you could put jack stands under it as well. either way, the wheels should come off as well as the tires for best results. sounds like for the price of all this, if you dont like the wheels anyway, you could buy some used ones. especially if you like the bullet wheels, those are available left and right. most people put aftermarket wheels on anyway. if you have the budget, just get your own aftermarket wheels/tires.