James, Exhaust Studs For Harley-Davidson

5/16-18 TO 5/16-24 X 1 11/16 Note: Exhaust studs as used in the M8 engine (OEM 10900015) is of a slightly different design, with a small protruding hex-shaped outer-end to aid initial stud-installation, but early style studs will still fit. Fits: 84-19 B.T.; 86-19 XL; 08-12(NU)XR1200; 87-10(NU)Buell XB Units: 10