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I spent some quality time working on it in the trunk, but got it done eventually.
If you have an old and a "new" unit, I think you could get by with removing the hex nuts (4 total - 2 on each side of the metal case) and the "guts" of the unit inside rather than the creative solutions proposed for removing the screws from the "thread side".
When I talk to Sirius, they clam up when I tell them that part of the story, what gives?
Sorry I can't be of any help -- I'm having the exact same problem.
Not all vehicles or devices are capable of receiving all services offered by Sirius XM.