I got an audio store to install my new head unit, but the new head unit turned out to be a bust. I know how to take the head unit out but the audio store gave me my stock head unit back but did not give me the stock wiring it came with. Is there anywhere that sells the part that connects to the wiring harness?

The audio store charged like $70 to install my new head unit so I don't want to spend another $70 for them to uninstall it.

 

theres no stock wiring. what they did was use the wires that came with the radio, and an additional harness separate that hooks up to your stock harness to the aftermarket one. What you need to do is remove all those harnesses and it should plug right back into ur stock HU

 

the guyz from the audio store did it different i guess. It appears that they cut the wire harness that connects to my stock head unit & crimped the wires to the wire harness of my new head unit.

 

What is the reason for putting the stock unit back in?

Are you 100% certain that they cut the factory terminals off of the factory harness? With the availability and cost of wiring harnesses now, I find that hard-wiring into factory harnesses is totally unnecessary.
If they did indeed cut the factory plugs off of the harness, unless they kept those plugs, I think you're in for some hell. Chances are though, if they didn't give you the plugs back with the radio they were thrown out.