That's a distinct possibility that someone drilled the bedside holes wrong. When I was restoring my bedsides that needed patches welded in around the fender mounting holes, I made dang sure that I located the holes correctly. I still have the sketch of the bedside hole location. Probably too late to correct that as you're already in paint. Fortunately no one can see both sides of the truck at once to notice that 1/2" fender position difference.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.