Help...looking for 15" sbp wheels

:help: Looking to upgrade from 14" to 15" wheels on the back of my kids 74 swinger. Just plain steel wheels would be fine. Does anyone know of any wheels that would fit off of another car. Preferably something newer so they would be readily avail at a local boneyard. They are the small bolt pattern book calls it 5x 3.94. I thought I had heard that some ford rims would fit? Any help would be greatly appreciated. Thanks