Problem with What NAV System to Install

[AaronHeidiHummer]

I just bought a 2006 H2 SUV
I would like to install a Navigation system in it, I have searched through Ebay and Google for a OEM Nav system. I have a few confusing things I would like to clear up.
1. They have 2 PN a 15800000 and a 15800001 One looks like a Non Lux and the other looks like a Lux fit with a Y91 and Y92 connection. How would I know what I have? I know my H2 comes with the Bose system, But does that not mean it comes with this Y91 or Y92 connection standard on a 2006 H2?

If any of you have completed this sort of upgrade to your H2 can you please pass the info on what I need for a PN and what is needed to install the Nav system?
If you have a website to show a OEM nav system for sale at a good price or info on this please pass this on.

Thanks
Aaron