I havent seen the old three prong connectors in quite a while.Except the one I had to replace with a 4 prong on my boat. I just bought a new motorguide for my Stratos 201 this summer and had to buy the newer four prong to mate with the plug on the motor, The new plug cost about $22.00 Im sure you could find one cheaper if you are willing to spend the time looking. Maybe try Bass pro shops. As far as BG, I have no idea. Although Im pretty sure there are a few places to call in glasco (Near Barren). Good luck