Model year seat belt differences?

[got2haul]

Is there a difference between the seat belt retractor assemblies used for bench seats in the 1973-1980 models and the 1981-1987 models?  Can an assembly for a 1987 pickup be used in an earlier pickup cab?  (I assume they all use the same mounting points and hardware and are interchangeable?)

[Captkaos]

You you can switch them between years.  There may be issue with the 73-74 models from what I recall on mine...