Boy was I ****** when my unit came in with the RBX. I thought I was getting the RBN that was compatible with the CD Changer. Dodge wasn't appologetic, just offered several fm modulated units for big $$.
Parts guy had mercy on me and gently suggested to go 'after market' and get better quality for less bucks. I looked around and saw that it was true.
There's no way you'll get anything to work with your face plate controls on your stock radio. FM modulatation (tying in your fm antenna line) is your only option. Otherwise buy a new after market radio AND a CD changer.
Good luck and let us know what you get!
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2001. 5 2500 SLT+, QC/LB 4x4, ETH, 6spd, 3:54 LSD, camper/tow equip. , NV241HD, Bright Silver, Snug Top, Ispro w/3 pod pillar w/tweeter, Pyro, Boost & Mag Hytec cover w/temp guage