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Drill a 3/4-inch hole on the driver-side A-pillar and a 15/16-inch hole on the inside of the door. I used the rubber grommet to hold the spring in place and the other slide bushing to allow the spring and wires to move freely into the door when opening and closing. Find a buddy with long arms to help you with the inside washer that will hold the slide bushing into place. I removed the door from the body to drill the 15/16 hole, but if you cut the square access hole you could just drill the hole from the inside of the door panel.