Stud,Exhaust Port

5/16-18 to 5/16-24 X 1-11/16". Note: Exhaust studs as used in the M8 engine (OEM 10900015) are of a slightly different design, with a small protruding hex-shaped outer-end to aid initial stud-installation, but these early Evo/Twin Cam style studs will still fit.

Fits: > 84-22 B.T.; 86-22 XL; 08-12 XR1200; 87-10 Buell XB

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