Hello, everyone.
I have got a question that hasn't been solved for a long time:

Recently I have seen a Cadillac Escalade '07 with a TV-Tuner on it. As I know, originally it isn't carrying any, even for European market. The most wonderful was that Tuner was original as far as multimedia system recognized it. So, it must be some kind of GM TV-Tuner for Europe with its part number. However, I haven't succeed in finding the device.

Just today I had a chance to get a TV-Tuner for CTS '08, all new and fresh. Part number for TV-Tuner (made in Germany by Fuba) is 25798601. Can it be used on Escalade or not? What may be that mysterious TV-Tuner for Escalade?

I would appreciate any help and any information.
Thanks!