All you need is a 4 digit code. You can call the general Mitsubishi number and give them your VIN and they should be able to give you the code to unlock it.
You have to get a code for it. You can get from the internet ir Mitsubishi, but its not free.
for a stereo? go to the12volt.com
go to __the12volt.com __aojedam
go to installdr.com to see how to remove and install a stereo out of any car
driver side under steerling wheel panel
http://www.installdr.com/Harnesses/Mitsubishi-Wiring.pdf
The mitsubishi eclipse has never had a bose stereo your 01 gs came with an infinity stereo, if your car does have one it is because it is aftermarket. To remove it you simply take the 2 screws at the bottom of the face plate that covers the heating and radio then remove the 2 or four depending how big your stereo is and pull it out.
http://installdr.com/ try this site i think it has what u need
http://www.the12volt.com/installbay/stereodetail/1541.html
you match them with the same colors
This website has a lot of wiring for many cars including '92 Eclipse. http://www.modifiedlife.com/1992-mitsubishi-eclipse-car-audio-wiring-diagram/
It must be right behind the CD player.