You will likely have to buy them each individually. The internal harness (aka the main harness) is the hardest to come across, but is also the least needed harness. What exactly are you needing?
Well the wiring on just about everything is shot to hell so I figured I could easily pick up the whole wire harness but apparently not, but your saying the main one would be everything internal like gauges dash lights horn and door switch control? Or would it be better if I just did the whole thing myself because I can do it just didn't really want to waste the time if there was one already available