Rock-Ola CD jukeboxes represent a later era of Rock-Ola production, featuring compact disc playback in place of traditional vinyl records.  Rock Ola CD jukeboxes went through different phase of electronics.  Most people will refer to them by the color of the metal colors, Oldest being Silver, then Black (S-5A, S-6A), then Red-Sybersonic, Orange-Advanced Sybersonic.  Some models spanned different electronics and players, it is always worth checking your electronics and player before buying any parts.