The 1986 thru 1988 C34 can with only one centered bow cleat. Most of us have added another cleat on each side. These are 7 " and I wish I'd added 8" cleats. The larger cleats have a longer horn to accommodate larger /multiple lines. You'll be able to secure the backing plate and nuts on the starboard side thru the center already installed Beckson port. To get at the port under side you'll have to install another Beckson on the inside port face in the anchor well. Word of caution - the wires to the running lights run high along that inside area. Use a short saber saw blade.