MCS-509465 - Used to mount exhaust to cylinder head. Note: Exhaust retaining rings are required for installation. These must be ordered separately. Note: The thinner 84-03/17-22 ''Early Style'' steel and the thicker 04-17 ''Late Style'' aluminum exhaust flanges are

Fitment:
84-22 B.T.; 86-22 XL; 08-12(NU)XR1200; 87-10(NU)Buell XB