I cracked the lower support bracket on my rear bumper somehow over this Winter. May have just backed up into hard ice pack at work one morning....
Anyway, the plastic bracket was a weird part to look up in MINI's parts cat due to the fact that we could see it on the screen, but only got a good number off the bracket itself.
There is a sub-bracket that attaches to the rear bumper bracket, it holds what I believe is the Tire pressure Ant unit[my technical German isn't the greatest.... ] The little sub-bracket attaches with 2 plastic rivets/ clips, and the bumper bracket attaches in turn the body with 4 plastic body nuts and 2 metal screws on the bumper section as well.
DYI info basically for anyone with the same Clubman as me...Part number is 51- 12-7-250-966

 

Old part removed. I lost the oval shaped grill inside the rear bumper as well. Still not sure where this happened, maybe a Valet since it's my car we tend to take to dinner due to the Clubman being a Valet friendly automatic versus our Manual Countryman.....
And at work, I would have seen plastic laying around in a parking spot since no one cleans up the lot really ever....

 

Thanks for the pic and install . What's the oval shaped grille you are looking for ?

 

I got, and installed the grill- That was the easy part since it came up with my VIN when ordering. The support bracket was the strange one since it wouldn't come up with a VIN input or almost any other work-around until we pulled the actual part number off a similar car that happened to be up on a rack at the dealer[ which meant no one had to squeeze under my car while it was still on the ground]