Going back to the stock air box as the open air filter gets too dirty too quick on a daily driver, especially one driven in the rain and I lost the ring gasket where the mass airflow assembly attaches to the airbox but can't find the part number. All I can find is the complete air box assembly. It's not a o-ring, but a square ring gasket - best I can explain. It goes between the mass air flow plastic piece and the intake - actually can't remember if it goes between the MAF/intake or MAF/airbox but one of the two.