The rear speakers are a non-standard size in that they are slightly larger than a 4" but smaller than a 4x6. You may have to fabricate an adapter to fit a 4" coax such as the Polk Audio DXi400, which is slightly smaller than the stock speaker size. As far as connections, you can take the stock wiring harness and solder it on to your new speakers, which makes speaker swapping easy. That way no wires are cut and when you go to sell the car, the stock speakers can be installed.