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They are an option at least to 1980 as my Ramcharger doesn't have them. Has the holes of course with plugs. I was kinda surprised they weren't standard on trucks by 1980!
9/1991 was when they became required in trucks with a GVWR of 10,000 lb or less.
Passenger Cars, except convertibles (Effective 12/11/89), Convertibles (Effective 9-1-91), Multipurpose Passenger Vehicles and Trucks with a Gross Vehicle Weight Rating of 4,536 kg (10,000 lbs.) or less
(Effective 9-1-91)
Shall be equipped with integral lap and shoulder belts at every forward facing, outboard designated seating position
1970 Dodge d100/eventually going on a 77 D100 frame
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