MickeyP, See the screen grab below from fellow Bolter rooney3100's 1956 3100 Gallery photos. Shows the installation location and orientation you seek. Mount bolts on the back side of the plate mounting bar go through the rear bed cross sill to secure to the truck if IIRC. wink
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Last edited by Gdads51; 04/28/2024 10:47 PM.

~ 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)