The doors are a direct bolt on from 73 up, except the full convertable top Blazers as allready mentioned. The interior panels are different, the shape of the vent window is a little different at the very top.
As for the gage cluster, and steering column there are some little differences from year to year in the pin position where the wiring plugs in. Can't remember exactly but around 77, 78ish they changed from a mechanical oil pressure gage to an electric one. If you are changing it to get away from idiot lights and go to gages its not a plug and play deal.
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