Spectre's Air Cleaner Riser Kit fits air cleaner and carburetor combinations with 5-1/8 inch diameter necks and was designed to space air cleaners above chokes, linkages, and more. This kit includes 3 riser rings measuring 1/4 inch, 1/2 inch, and 1 inch and can be stacked for increased heights. Manufactured using high quality materials this product is engineered for optimum fit and function.