What harness are you looking for specifically? Engine bay, under dash? I know the turn signal for a 72 uses different sockets then a 73-77 so you cant mix and match those parts, I assume the engine harnesses are probably the same way too.(this sucks because its allot easier and cheaper finding a turn signal for a 73-77 then it is for a 71-72)
well i have a 76 and a 77 but the harness in the 77 has a different plug for the guage cluster how hard is that to change or can i just change the plug?