A couple of us looked into the TNR (2005 Touch-Screen Navigation). At the time, we could not get one from GM. Things may have changed since then.
A dealer connected his Tech2 tool to a new 2005 Hummer H2 SUT, and interrogated the system for the part number of the TNR installed. The result was part number 15120706.
Check with Partsguy here to see if it is now available.
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