Secret Optional GPII Rear Diffuser

MotoringFile writes about an unadvertised optional rear diffuser available for the MINI JCW GPII.  Here are the part numbers and cost:

51747370213 and 51747370214 (rear brackets – 9) – about $45 each

51747330559 and 51747330560 (left and right air ducts – 8) about $48 each

51747330558 (air duct center – 7) about $110