I had some fun repacing the door speakers in my "94 Escort GT this weekend. They needed replacing for awhile. last fall I disconected the one in the passenger door because it was blown. I found a pair cerwin vega 2 way speakers that looked about the right size for a price that I couldn't pass up. So using the instructions from my trusty Chilton repair manual. I took off the door panels. the new speakers were a little smaller than the old ones and had 4 "ears" with screw holes instead of the 3 on the stock speakers. Also the old speakers have a special conector and are not marked + or - So it wasn't going to be a simple swap, darn it. You could replace the whole stereo and run new wires then you would know the polarities. But I'm cheap and my stereo still works. First, I figured out what wire was positive and what was negitive by turning on the stereo very low volume and using a DC voltmeter. But if you don't have a meter you can use some wire and an AA or AAA battery and do a pop test on one of the original speakers. Google search "battery pop test" for the procedure. . Here is the cool part. I used the outer part of the old speakers to mount the new ones inside. I cut the three "spokes" on the back of the speaker that held the magnent to the outer ring with metal shears ( tin snips ) and just tore away the cone leaving just a metal ring with the three screw holes. The new speakers nestled right inside my newly made mounting rings. I attached the new speakers to the rings by simply making tabs on the outer edge of the ring to bend over the edge of the new speakers by making four pairs of short radial cuts next to each other to form a tab. I also used some silicone adhesive caulk to make sure there wasn't any rattles and buzzes. I also reused the old speaker to wire connectors by soldering them on to the new speakers. They sound great and I didn't do any drilling or cutting on my car.