Port-a-walls will work if you have rims with a wide enough sealing area. Most manufacturers went to a wider wheel designed for tubeless tires in about 1957. The earlier rims were not really designed for tubeless tires and with Port-a-walls it becomes even a greater risk. Port-a-walls were the big thing when I was in high school. If you have the older rims, I would recommend a tube designed for a radial tire.