U-Nut For Front Fender Size?

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Hey! Try this. If there's a Lowe's hardware store near you, go to their not and bolt section and look for all those drawer style bins that have all sorts of weird hardware in then. They actually sell GM body bolts as well as those Captured Nuts you are looking for! All different sizes, too! They also have ones for Ford. WHen I put a truck together I cleaned out like 4 stores of stock, waited for a re-stock, then did it again. They will keep stocking.
Lowe's.... Go figure!