Quote:
Originally Posted by Chevy nutcase
 when removing the front body mount bolts I found they were the super common 9/16 variety but the thing is the head of the bolt I think is 13/16 and the nut is bigger at 7/8.... why? At any rate I got new ones at a tractor supply and what do ya know the bolt and nut are again not the same?
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The, American Standard Finished Hexagon Bolt. Spec, is for a 9/16" bolt to have a 13/16" head, across the flats.
And, the American Standard Finished Hexagon Nut. Spec, is for a 9/16" nut to be 7/8" across the flats.
The fitment of those replacment panels is pretty much par for the course. In regards to restoration work. You'll probably also notice, that they are sometimes, also not really complete. Often missing re-enforcing layers and, finished edges where the panel naturally ends. Along with poorly located and stamped features. They are really just a semi-finished ruff guide of what you need/want.