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I think I am answering my own question here.
After a ton of decoding Vins online,
B26 AMG AERODYNAMICS PACKAGE
appears to be the factory option for a real factory wing.
yes, B26 AMG Aerodynamics pack includes "Elements of the AMG aerodynamics package: front bumper with larger front splitter and additional flics in matt black; fixed rear wing in high-gloss black; side sill inserts in matt black. Not with AMG Exterior Chrome package (750) or AMG Exterior Carbon Fibre package (773)"
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
