I received my E70 X5 M Diff from FedEx yesterday. Unfortunately they dropped it at some point and cracked the side casing near the actuator motor exposing the gears. I can confirm that axles (Trakmotive BM8116) from a 14+ X5 will NOT fit the stock E70 M diff flanges. They are too large.
I ordered another E70 X5 M diff complete with axles this time and a new driveshaft nut. Hopefully it arrives intact and I can get my vehicle back on the road.
Any tips on the 50mm driveshaft nut besides heat and muscle?