I finally bought a radio for my 2002 GC and installed it. The right door speaker isn't working and I see it's a plug-in arraingement and not the 2 simple wired my old school brain expected. Do I need to find a genuine MOPAR replacement or are there aftermarket speakers that work. It's a 5x7. Also, how can I tell if I have the Infinity system? Crutchfield has speakers available.