Slick 60's

The bodywork on the fenders is finished, cause someone sideswiped something and put a huge crease in it. So my dad and I tested fitted the fenders, and while doing so I noticed a bolt hole located behind the fender, and on top of the fresh air duct, just below the cowl. Never noticed it before, but I was wondering what this bolt hole is for? Thanks.

That is for the bracket that the inner and outer fender bolts to. There is one on each side. It has 2 holes in it that line up with the 2 holes in the inner and outer fender closest to the firewall. The hole in the bracket that goes up against the firewall is slotted for up and down adjustment

said bracket is only used on the 61-64 trucks.

thanks, I never noticed the hole before, and I never saw anything bolt there when I looked at other trucks.