Are the original factory brackets the same length and have the same angel twist and flat flanges as the reproductions? I was going to use the correct mounting kit not the aftermarket one but hesitate attaching the bracket and washer to the bottom outside of lower fender extension, not to the inside of the extension as you do with the repro set. That attachment point may damage the paint etc if the spoiler is banged around??? GM AIM says differently.........refer to AIM D80 A1
Thanks for the help
The attachments as shown in the A.I.M. are correct.