BMW Genuine M Performance Rear Diffuser Spoiler Carbon Replacement 51192455819. The images are for illustrative purposes only and the product may vary, depending on your vehicle. Represented by part number 18 in the diagram. Note: Note: For Mainland China: Retrofitting not following GA-801 2019 is only allowed for use on race-track and not for use on public roads according to the relevant retrofitting regulation. For G20 and G21 Mirror Caps, Side Sill Attachments, Roof Antenna Cover and Rear Spoilers do not follow GA-801 2019. As front attachments are only released in combination with rear spoilers they have to be treated as parts which do not follow GA-801 2019. MSP Special Equipment: Yes = 0715 M Aerodynamics package No = 03AC Trailer coupling Only in combination with: — Bumper trim black high-gloss rear (M Performance) 51 19 2455856 1. 3′ G20, 3′ G21.