This is a brand new OEM Mercedes-Benz Carbon Fiber Rear Diffuser for a X290 AMG GT 63 or 63 S sedan 2019+. This unit will replace your stock diffuser. Track Page Views With. Auctiva’s FREE Counter. The item “Mercedes-Benz OEM X290 AMG GT Sedan AMG Carbon Fiber Rear Diffuser Brand New” is in sale since Friday, February 28, 2020. This item is in the category “eBay Motors\Parts & Accessories\Car & Truck Parts\Exterior\Spoilers & Wings”. The seller is “euroactive” and is located in Olyphant, Pennsylvania. This item can be shipped worldwide.