I’m currently out of town on business but I can take more pictures when I get home. I mirrored the starboard factory wire for the port side speaker wires. I used a string with a screw taped to it and a magnet to get the string through the tower then taped the wires to the string to pull the wires through the tower. When I pulled the tower up on the port side the rubber and tower had a hole through it already. I did have to drill a hole in the side of the boat. The rubber left a mark on the hull so I knew where I had to drill the hole at. Fairly easy, just time consuming and best to have a buddy help.
Hope that helps. If you need more or it doesn’t make sense, let me know