Originally Posted by M.J.

My Z had the base stereo in it. I was able to mount a pair of Alpine SPR-17s 6-3/4 woofers in the doors using the adapter rings that came with the speakers. They were maybe a 1/4 inch thick and did not require any cutting of the stock speaker mount. It was a simple bolt/screw in. But then again, I think they are only 2-3/8" deep.