Weird, I don't think MINIs have rear brake show, at least my one doesn't, the spring kit has a part number: 34410410825
Here:
http://bmwfans.info/parts-catalog/E9...e_brake_shoes/
The part number you are quoting seems to be the whole shooting match.
http://bmwfans.info/parts-catalog/E9...es_value_line/
http://bmwfans.info/parts-catalog/34212213311/