Beemer Driveshaft

I had my rig booked for the Driveshaft inspection. But it was up in the air as if It would be replaced at 45K  plus they would be replacing the diff oil with their's. Being a rig I use my own concoction and I would have to just redo it. Sort of a waste. It was also next week and I needed to extend my insurance so I cancelled .. I know Ron bought a drive shaft and I was going to just buy one and do my own thing but Kelowna said they couldn't. Any one else out there just buy one and where did you?  Black foot has it listed but the parts person at Kelowna couldn't find the part number. Just wondering if I should just order from them as I would be happy to just buy one. 
Ideas ?? I have real trust issues with Dealerships after my Bentley experience.