Listen to Champ. 7" wide factory rims had 4.25" BS. In order to have wheel centered up in same location with 8" rim (1" wider) add 1/2" to the 4.25 BS number. This way, the wheel is still equally centered, just 1/2" wider on each side of centerline of mounting surface. So, like Champ said, 8" rims with 4.75 backspacing will center the wheel up exactly like the factory wheels were centered up.
Good Luck,
Tony
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