Hello, I recently bought new JBL Club 6522 speakers for back, as the old ones have now blessed the time. Since I wanted to do it right and the car is extremely loud inside (sloppy accident reperature, lack of insulation mats, drowsing etc.) I immediately got alubutyl and some insulation foam and insulation fleece… back seat out, everything resealed as well as possible… Today I notice that I ordered from provided the wrong speaker size (16 Is there an adapter for this and does that make sense at all? I guess in the front of the footroom it makes little sense to install it, if I already have tweeters up there? Should I just sell the JBL again and buy a set? (I would also like to replace the front LS because I have licked blood now) Last question: If I am expanding the radio, do I need the code? Thanks! Opel Corsa D 2009