Try having to locate and drill new holes in a fender that never had them! Ask me how I know... And I think your roof spoiler holes are probably from the trim that was used with the 3/4 Vinyl Roof...
Im from Tucson as well.....been trying to build mine for the last 4.5 years lol I was hoping to have it in the fords on 4th show but all i have is the motor and tranny in and it still dont run. Working to much at work and then new house