Thanks kaktuso - the first link was especially informative but I just want to make sure I am reading things correctly:
" There are many radio options for the 2002-2007 KJ Liberty.
From 2002-2003, the RBB was the base radio available on Sport. It featured an A/M-F/M radio and a cassette player. It also featured manual bass, midrange, treble, fader, and balance controls, as well as CD changer controls (a CD changer was not included). U Connect Hands-Free Bluetooth Telephone was an option for this radio. This radio was only available with the standard sound system."
I take it that rules out RBB for my Jeep as it is a Limited?
"Standard from 2004-2007 on all models and the standard on the 2002-2007 Renegade and Limited Edition models and optional from 2002-2003 on the Sport was the RBK. It featured an A/M-F/M radio and a single-disc CD player. The radio, however, could not read MP3-encoded discs, and did not have Radio Data System (RDS) capabilities. It was, however, adaptable for SIRIUS Satellite Radio on later models, and was adaptable for U Connect Hands-Free Bluetooth Telephone. Later, an auxiliary audio input jack became standard on this radio. Manual bass, treble, fader, and balance controls were on this radio (these controls were later changed to onscreen, digital controls). This radio was available with either the standard sound system or the Infinity Gold premium sound system."
Ok - since my build list lists a unit with both cassette and cd w/cd changer controls that rules out RBK as it has no cassette?
"Optional on all models from 2002-2007 was the RBP. It featured an A/M-F/M radio, a cassette player, and a single-disc CD player. The radio had CD changer controls, though a CD changer was not included. The radio could not read MP3-encoded discs, however, it had the Radio Data System (RDS) capabilities. SIRIUS Satellite Radio could be added on later models, and U Connect Hands-Free Bluetooth Telephone could be added as well. Manual bass, treble, fader, and balance controls were on this radio, and this radio was available with either the standard sound system or the Infinity Gold premium sound system. The radio was the only radio available for the 2002-2007 KJ Liberty that could read MP3-encoded discs, and had Radio Data System (RDS) capabilities. It was adaptable for SIRIUS Satellite Radio as well as U Connect Hands-Free Bluetooth Telephone, and had manual bass, treble, fader, and balance controls (these controls were later"
So to me the unit in my Jeep would be a RBP - am I reading this correct? Also - this paragraph seems to contradict itself first saying it can't read MP3 discs and then it says it can. No big deal but just curious.
Thanks again kaktuso for these links