I agree with what youve said, until i do more research and Im stuck back in a cirlcle.
My Blue base 986 doesnt have a side skirt, And if it does, then its flush to the car. When you look at the blue boxster, the side skirt is symetrical and smooth the entire length.
When you look at the silver car with aero kit, you can see a raised center of the side skirt that gradually blends out.
When I search 986.559.980.00 I have found aerokit parts. that are the same side skirts as the 98655998400G2X) and (98655998304G2X)
the yellow car had its side skirt listed for sale as part986.559.980.00
in grey is the parts i want to buy. The look to be the aerokit side skirts and imo nothing like my blue boxster skirts. But they have the 986.559.980.00 part number.