I don't see an issue. Is it the front left or front right? Can you give me the last 7 digits of the 2012 axle and the 2007 axle? Just want to confirm.
2012 base axles -
2012 Mini Cooper Base Hatchback - Axles, Bearings & Differential - Page 1
2007 base axles -
2007 Mini Cooper Base Hatchback - Axles, Bearings & Differential - Page 1