with 6 clips they're definitely pre-55, might even be older car .... unlikely anyone removed a spring leaf - the 15's were the standard, 16's gave a higher GVW, check your door tag for a GVW above or below 4500# ... you can find a taller tire in 16's but there's appropriate height 15's available, and any radial will be tubeless, not sure where you're looking you can't find them unless it's the bias plys from the "antique" dealers - skip that, get radials
Bill
