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I have an 06 sss w/out onstar. I do have the shark fin antenna. I found a rear view mirror with onstar, anyone know what itll take to make it work?


I'd be interested in this information also. My other vehicles have had it & would like to be able to add it to this one. Dealership tells me it can only be installed at the factory but someone has to have installed it themselves by now.

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