Ken, thanks again for your reply and the information.
I did check my CCC board, and have a 32 pin socket, with a 28 pin (ver. 2.3) eprom chip. (see attached)
I was under the impression that I needed to have a CDM4 since the instructions referenced it and also showed it in the drawings, when converting over to a CDM12.
I also had read that the frame for a CDM4 was different, since it had a different CD player.
BTW, I found a Rock-Ola eprom for sale (ROCK-OLA JUKEBOX EPROM #58824-3.9). I guess my question is, would upgrading to this version eprom suffice or is there more benefit to wait and find a version 4.3? For that matter, since I am convertion over to a CDM12, should I be looking for a ver. 5.3 eprom?