Harley-Davidson 17-23 M8 Screamin Eagle CNC Ported Water Cooled Cylinder Heads. Part Number: 16500483/16500487. Harley Davidson (Water Cooled) Touring Models. ALL OEM PART NUMBERS ARE PROVIDED FOR YOUR REFERENCE. INTERCHANGE ISDETERMINED BASED ON SEVERAL FACTORS AND RESEARCH DONE BY OUR SALES TEAM, PLEASE. CONFIRM WITH YOUR LOCAL DEALER THE EXACT INTERCHANGE.