I made a hole right behind passenger head, just above the factory ribs in the firewall. I can shoot you a pic if you give me an email. I have the gm harness as well and it worked out perfect. I ended up finding a grommet in the junkyard from a Toyota from the door jamb harness, it was exactly 1.5 inch which was exactly the size hole I made in the firewall. I cut and taped it into the harness, worked out great.
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