[Captkaos]

All COMPLETE functional doors will physically bolt onto any truck.
The issue is the 76-down is the non-power version so if you want power you can't use stock stuff, AND the stalks are different for the 77-up vs 76 down. So if you want to use the 77-up panels on the 76-down doors, the stalks won't work, BUT you can use the 77-up manual guts in it.