You could try looking on eBay or find someone that is selling a vehicle for parts.
It will tell you in the owners manual are you can open the drivers door and look at the sticker in the door jam and it will tell you too.
look in the manual
Check with your local Chevy dealer on that.
Look in your owners manual for the directions.
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it should be in the fusebox, look in your owners manual if you have it.
Consult your owners manual...
YES
No, Chevy changed the wiring harness in 2003. and the way it is mounted, it can be made to work though.