So I assume I just go through my dealer who will order the plates via skiers choice. The plates will be just a flat plate? And I'll have to buy mounts for whatever speakers I go with? JL has upper and lower at $200 per set. That seems on the high side. I like the Roswell R-1 speakers but don't know how I would mount them in the stock upper and lower location. Everything seems to want to hang on tower pole. I'm sure there is an easy answer to this so I apologize. New to wake boats. Thanks