Well then....that lessons my concern. I have the 10 slots, the three holes for the caps, and they came with 4x4 center caps. I'm fairly certain I have OEM wheels so when I take the tires off I expect I'll find they are 8in. That's a good thing. They have worn out 31's on now and i was trying to verify width with a tape measure but didn't know how many OEM widths there were. I did a test fit with the 31's and have no clearance issues so if they are 8's my options are wide open. Whew ! i was afraid I'd unknowingly bought too wide a wheel. Guess I got ahead of myself.

Thanks for the good info...