[sickcallawayc12]

Your stock size is the CG/GC because those are bigger than the typical single DIN. CG/GC is one and a half DIN and should be relatively easy to tell if it will fit because its an oversized radio. I don't know of a list that says what vehicles have this size, but it was only on GM and Chrysler vehicles. Here is an example of what the radio is gonna look like sizewise and should work with your caprice.

http://cgi.ebay.com/ebaymotors/GM-BU...mZ120145205279

I'm guessing your cassette player is similar to this

http://cgi.ebay.com/ebaymotors/89-96...mZ170134342204
Good thing is that GM uses the same stuff in many of their vehicles including radios so there can't be that many "different" Delco radios out there.

There are not many aftermarket options that are CG sized. Pioneer is the only one I know of with such a size which is this

http://cgi.ebay.com/Pioneer-DEH-P47D...em230156808815