The Vision Wheels I had on my 79 Hurst Olds had a 70.3 bore.......
I did have a mic and checked mine so if you want it to fit correctly, rely on accurate measurements done by yourself.
I don't trust it when people GUESS............when it comes to this type of information.
I'm the only one who posted the size so you must be referring to me. It was not a guess, it was actually looked up on a chart at my friend's shop and I can assure you the hub rings I got fit perfectly in the hub.