With the speaker review search I did one on some over the counter radio's as well, the first one that I had purchased was also returned with the 1st set of speakers, I went with middle of the road upgrade in the radio, an off the shelf Pioneer. The install kit calls for a interface wiring kit that really only keeps your chimes, key-seat belt in place, for $49 I did not install it.

The dash plates and door panels were a task to remove, but with a U-tube video it when along fairly quick, without the interface wire kit I needed to find a wire that was key on only, wiring diagram showed these at be light tan in color the one I used was easy to find and tap into.
Radio and speakers were a great improvement over the original equipment.