For Sale: I have 2 15 x 10 Buick Rallys that are NEW. They are 5 on 4 3/4 with 4.5" back spacing. Perfect for 295 50 15 tires, never been mounted. Put some factory looking wheels on your badass GS. $400 for pair plus shipping. If interested call Curt at 515-450-3446. Thanks!
Are you sure about the back spacing? A 10" wide wheel needs 5.5 to 5.625 back spacing to fit the 70-72 Skylark/GS. 4.5" B.S. works for an 8" wide wheel.