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No special place, gromets on the driver side.. I think there only are 4 or 5 there.. The Gromets are the rubber isolators that insert into the firewall and protect wires from the sharp edges of the firewall, and keep water/dirt/hot or cold air out..
He's right.
It's eather the windshild groment or firewall groment. There is a panel under the kick plate on some D's. If you look under the truck there could be a panel right under your feet but closer to the front fire wall.