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I would consider it "substantially identical" because the XM converted to SIRI, but then again I am just guessing.

This is what Tax Cut Premium (2007) has to say about the issue:


Here is the link to the IRS: Publication 550: Wash Sales.
I was very interested to learn of the calculation for the cost basis....

This is definately something that you should discuss wih a PROFESSIONAL, and not take the advice of someone on the boards who may or may not be correct.