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Well, I think I'm going stick with my original perception in that the only three spoke wheel offered in 1970 was the 15" wheel as used on the 69-75 Vette. I can't find any proof (so far) that the 16" Thumb Grove wheel was used on anything other than the 69-70 Buick GS.
Everyone agree? (If not, let us know...)
Ed
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We're all good