the complete set includes both front and rear mudflaps..
they are NOT the stock mudflaps that bolt-on to the stock fenders.
They are the upgraded style that goes with the 20inch wheel package that has the running boards...
not sure if having the aerokit makes a difference since it is designed for the larger fenders and wheels..
i don't think BMW has an aerokit only specific mudflap style...these should be the ones that work with them.. see below info from BMW.
http://accessories.bmwusa.com/ItemVi...=0&subItemId=5
shoot me an email if you are interested... it's a great deal!! and they are new, never used still wrapped in plastic...