The site is down right now...

Basically, they took a 2003 Escalade EXT Nav system and put it in a 2003 Avalanche. THe system fit perfectly, but had a glitch with the volume, but Delphi said they were going to fix the problem (soemthing to do with the type of amp they put in Avalanche compared tot he type they put in the Ext).

I see no reason the same thing couldn't be done to a 2003 H2.