VERY Short Term Build Wheels

Pulled the whole driveline and suspension out of my '68 Barracuda Convertible project and replacing it with one from a '74 Duster with a disk brakes, but changed the wheel bolt patter to a 5x4.5. Now unplanned for, I need to shop for throwaway wheels/tires for the restoration project until we decide on final wheels.

Paint is going on next week and striping color, polished vs blacked-out metal work, and other factors will determine what the final wheels will be. Until then, we need to be able to move the car around at the body shop, so have been asked to find wheels/tires.

What is the is maximum wheel/tire width and height people think I can use, as I simply want to buy the cheapest used items I can find?