15x7 wheel for 31x10.5 tire good or bad

I'm wanting to get a set of Indy mag slots/kidney bean wheels for my CJ5 and want to try to keep the factory offset.
Will a 31x10.5 be a good fit on a 15x7 wheel or should I go with a 15x8? The offset goes from 3.75 to 4" between a 7 and 8" wheel.
What was the offset on the original slots!?

Thanks in advance.
 
I'm wanting to get a set of Indy mag slots/kidney bean wheels for my CJ5 and want to try to keep the factory offset.
Will a 31x10.5 be a good fit on a 15x7 wheel or should I go with a 15x8? The offset goes from 3.75 to 4" between a 7 and 8" wheel.
What was the offset on the original slots!?

Thanks in advance.
I ment to post this in a tech forum.
 
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