Part Number MCC150B 1 Inch Air Cleaner Riser 1/8 inch Thick Plastic 5 1/8 Air Cleaner Flange Offset Ledge On the Air Cleaner Side For The Air Cleaner Base To Seat To For Customers With Carburetors With A 5 1/8 Neck Size That Want To Raise The Air Cleaner 1 Inch Higher BE SURE To Consider Hood Height When Raising Your Air Cleaner.