So here'* my problem... I have a Canadian '04 Bonneville in which XM radio was never an option. Factory XM radio wasn't available in any Canadian GM vehicle until I believe 2006. Sadly, it seems that we trail behind our American friends in many of the technological 'toys'. So, I got ambitious and added the required wiring and components to make my vehicle 'XM Ready'. Everything except the tuner has been readily available. I'm currently using the Sirius SIR-GM1 tuner to get satellite radio through my OEM stereo. I'd really like to add a factory XM tuner but GM tells me they aren't available for purchase. The only tuner I've been able to acquire was from an auto wrecker. According to the GM service documentation, an XM tuner also has TheftLock which can't be deactiviated like it can with stereo head units. In fact, they specifically state the receiver must be replaced if this condition is activated. Since this was never an installed factory option, I don't believe I'll have success getting a replacement receiver. I'm not sure I understand the logic around such intense restrictions placed on these, especially now that XM Radio is availble to Canadian residents. I'm quite happy to pay for the parts and subscribe to the service but nobody seems to want my money! Has anybody ever tried to add a factory receiver to an originally non-equipped Bonneville? Any help, thoughts or suggestions will be appreciated. And yes, my friends have already reminded me about how ridiculously obsessive I am when it comes to original parts!

Thanks in advance.