15” wheel question

ok here’s my problem, my 66 has 14” wheels and the 9-3/4 poverty cap. I want to use a 15x7 wheel but the wheels I have are the smaller 8-3/4 (later model) and bigger 10-3/4 circle (the diameter of those nubs that hold the cap on). Was there a wheel made in 15” that had the middle size nubs? Maybe in the 63-66 years? I didn’t see anyone who made aftermarket ones.