These are ideally sized for 1-3/4" exhaust pipes

CAD plated phillips head screws and acorn nuts are exact replacements as used on 1949-up FL

washers and nuts used on 1980-1985 FXWG

• Accepts 3/8" NPT or 1/4" NPT petcock (Left side 1/4"

8mm/3 inch Primary Open Belt Drive - Kick Start - Spline Shaft - 1955-1984 Harley-Davidson Big Twin Inside Diameter_.313" These are ideally sized forLooking for that classic open belt drive look with rock solid performance for your vintage Big Twin? This 8mm, 3 inch open belt drive from BDL is widely regarded as the best combination for all around riding and dependability. Proven Dependability: The 8mm, 3 inch belt drive is a time tested setup known by riders for its reliability and performance in all around riding conditions. Specific Vintage Fitment: Designed specifically for 1955 1984 Harley