Doug,

Just a really big WAG here, but first thought that comes to my mind is access holes for outer skin dent repair??? headscratch

Those will be a bit of a challenge to fix, sorry to say. frown


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)