I see from your profile that it's a 96. Some of those did not come with the CD control buttons on the radio. If it doesn't have auto climate control now, it would be a pain to add in that SHO radio. I think if you find a stock replacement radio for a 97-99 with manual climate controls, it will plug in and control the CD changer (which you'll also have to add). I also saw that it is a Vulcan engine, which is either a G or GL model. I don't think those had the option for a CD changer.
Not a big deal though, I added one to my 97. I bought it on Ebay new, and it came with the cable to plug into the radio control unit (it's a silver box under the carpet on the left rear wheelwell). Installation was simple, but I mounted mine on the underside of the rear speaker shelf.
Brad, is there any way that you could figure out if a CD-compatible radio could be added to control the changer?