Any mygig 430 (RBK), or 430N (RHB) or 730N (RHR) will work fine. Do not worry about the part numbers that much. As long as you have a radio that is made in late 2010 and up, you will be fine--- PROVIDING that the radio is a HIGH SPEED BUS version and NOT the low speed version. My radio(s) I had in my truck (430, 430n, 730n) each one came from a different model, ie, Jeep, Durango. There are other mygigs 430 (RBK), or 430N (RHB) or 730N (RHR) that are older made before late 2010, the reason why I recommend a radio that is made as CURRENT as possible, is that for some 2010, all 2011 and 2012, the radios themselves had a software AND HARDWARE change that allowed for some new features that are NOT in the older mygigs. ie, replay (rewind/pause) satellite radio being the big change.
As long as the radio is High speed and the screw mount holes are on the side of the radio and not on the top and bottom (made for some jeeps and other Chrysler models), you will be fine. Simple unplug and plug back in, you are ready to go.
When you see a radio online (Ebay) pay attention to the sticker on the top of the unit. It will tell you the day, month and year it was built.
If you try to go by the part number alone, you will go insane as I found part numbers on my old 430N radio to not show up anywhere online. But it worked!