Picked up my nearly new pontoon boat today. It is an insurance deal with some fixable damage to the rails. It is a 20 ft. Sun Tracker and it HAD a 2008 Bigfoot 60 hp.4 stroke. All the cables and controls are there but no motor. I want to use a 60hp as well. What other years will work with this harness and is there adapter harnesses available for older model Mercs.