Klaus:
I gave the number 12498768 to the parts guy at the local dealer. He called someone at GM, who told him the part number was for a C/K pickup and that the software would be incompatbile with the radio software for the H2. Also, he could not find out if the part number was the whole kit or just the radio itself.
I figure you know more about it than they do. Have you researched the issue to determine that buying the part number will get "factory" XM in my '04 H2 without having to do anything more than drill a hole in the roof for the XM antenna?
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