Used OEM Delco Radio and speaker question

Hello all,
Glad to find this site.

Does anyone know of a good OEM Delco radio site?

Would like to change my cassette to a CD player.

Also...Would ther be an avaible radio/cd player that has an equalizer also that would fit inot the dash?

I dont want to start with dash mod kits and wiring harness kits, just PnP.

Also what size speaker are in the rear area by the hatch, my drivers side has no audio and before removing the panel I would like to have a pair of new speakers to replace the factory ones.

Happy New Years!
Thanks.

Dave-