What size Rubber(Slick) Fits 66 Cuda

What is the back space on your steelies?
They have 3 3/4 back spacing on them from the drum / mounting surface to the edge of rim.The guy that i got the wheels from told me they came from an early 80's Diplomat .I got lucky .Fortunatly he let me check to make sure they fit ,before i paid for them...

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