Alot of people dont know this, but there was slight changes in the mounting location for seatbelts in these trucks, I found out the hard way. 73-79 models work in 80-87, but 80-87 model seatbelts dont work in 73-79 cabs. Mounting holes are slightly different between the two cabs. I still looking for belts on my 74.
The later model ones worked fine for us
We installed the entire interior from a 82 into our 76 with no issues at all other than swapping the window crank handle splines for longer ones because the 82 for panels are thicker , which opened a big can of worms when we figured out we had the one year only 1973 doors with the tiny rollers so you couldn't swap the entire regulator, had to swap just the crank splines, which is doable but you gotta use C-clamps and be careful to not lose a finger. The regulator spring is plenty strong enough to chop off a digit
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