Can I put 20 inch rims on my 1966 Mustang Coupe? If so how?

I would like to put Carrol Shelby All American Racing Rims on the car, which i would want 18inch in the front and 20’s on the back? What should i do?

1966 slot car racing, early days of London slot car racing, not scalextric

People get the chance to race in a grand prix by steering models of the cars round a track. M/S of a man fine tuning a 6 inch model of a car. It is for the race track which seats eight people at steering wheels up the side. They control the cars as they race [...]