Just an idea...why not get some newer seats, out of a newer Dodge Quad Cab truck? Old style, like 99-01 or so...they had the high back seats with the shoulder harness built into the seat...that would work well for your application, I would think...
I haven't seen any RCs or TDs with shoulder belts in the '70s, but I have a few '70s pickups with shoulder belts...
My main driver '76, built 12/5/75, has lap belts only
my other driver '76 big block shortbed, built 7/16/76, has shoulder belts
my parts truck in the back yard, '78, has shoulder belts
my dads M880 military truck '77, has shoulder belts...
Must've been an option for a few years? At least in '76? Or maybe a mid-year intro?
JS
I haven't seen any RCs or TDs with shoulder belts in the '70s, but I have a few '70s pickups with shoulder belts...
My main driver '76, built 12/5/75, has lap belts only
my other driver '76 big block shortbed, built 7/16/76, has shoulder belts
my parts truck in the back yard, '78, has shoulder belts
my dads M880 military truck '77, has shoulder belts...
Must've been an option for a few years? At least in '76? Or maybe a mid-year intro?
JS