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So those are 15x10 with a 4-7/8 BS with a 5x4.5 bolt pattern. That BS was common on a 15x 10 wheel from centerline, i had a set like that years ago.
5x4.75 is Chevy bolt pattern. Mopar 5x4 or 5x4.5. And those are not unilug. they are single bolt pattern.
Wheels are sold, thank you very much for the interest.
I have 2 15x8 SBP with 4.5" back space And 2 15x6 SBP fronts. Brand new, have tires mounted on them but will be removed. Wheels are in Canada, so...