I'm in the process of upgrading the stereo in my 1987 560sl. I bought a pair of Infinity Kappa 4" coax that unfortunately did not fit. Does anyone have any suggestions for aftermarket speakers for this car. Do i need to step down to 3 1/2" speakers?

Does anyone have any input to taking the stock head unit out. I'd rather install the head unit myself in order to save a little on installation costs. thanks ahead of time.


dan