I have a ram mount for a Helix 7 or such size fishfinder that the shaft is 3 inches long and has a spare shaft that is 6 inches long. Both are in excellent shape for sale for $50.00 shipped to your door. I also have 2 20 ft long 8 pin Ethernet extention cables that are in excellent shape for $50.00 each to your door and lastly I have a 10 ft. 6 pin Humminbird transducer extention cable for$ 40.00. to your door.