I want to mount my FL-20 to a Johhny Ray quick detach swivel mount in my boat. I will be using the Minn-Kota built in sonar on the trolling motor. The only mounting bracket that I have seen to do this is included in the kit from Vexilar. I do not really want to buy the whole kit because I will be paying for the high speed transducer that I don't need. Any suggestions?