Hey Bob, that adapter can be bought at any walmart, Best-buys, or circut City for 15-20 dollars. As a last resort you could go to a professional installer and ask them to order you one. That sony should sound WAY better then the factory. I myself use an old '97 Kenwood with infinity/ JL speakers and I did the labor myself. Oh by the way, when you do switch out door/ rear panel speakers, remember the dash are wired as tweters and teh doors are midbass. I learned that the hard way, by putting coaxial speakers in the dash and they didnt sound right. Have fun and enjoy your install.
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Volvolistic!

Also I would like to know if I am better off swapping the stock radio for an aftermarket radio???


mis -read that


anyway and always it will make a difference. even if you dont change the speakers right away changing the stock Head unit makes a huge difference.

1. Nope.
2. Depends on what you are trying to accomplish and which head unit you have and how big is your budget. Ya know? If small budget or modest goals, get an amp with speaker level inputs, else buy new stuff.