Is there an OEM Nav System for Armada SE?

I have a 2004 Armada SE with the DVD and leather package, but no Nav system. I want to add the factory Nav system in the front dash - is this possible? If not, is there an add-on kit that can still be 'internal'? I've used handhelds before and while they are nice, I would like it to look as original as possible.

My Nissan dealer told me it cannot be done. They also told me that XM wasn't available (it is - the module is $325), and they told me that the Class III receiver hitch was $800 (and it's actually $240). They try hard, but sometimes they don't know the full capabilities of the vehicle and / or Nissan Corporate.

Any help would be greatly appreciated!

Drew