If you have a wheel that LOOKS LIKE an AO or a YA, check the bolt pattern. It could be a Ford wheel. I tried to buy a used one at one of the local tire stores a couple of years back and fortunately the owner knew his stuff. He knew I'm a GM guy and asked me why
I wanted it.
Don't know if those are 6" or 7".
Like Steve, I haven't run across anything but 7" for Chevys.