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Motorcycle exhaust studs compatibility compatible with Har-ley 1984-2015 motorcycles, replacing worn exhaust port hardware to restore a secure seal between the cylinder head and flange and reduce exhaust leakage. Exhaust port stud sizes total length 43mm, short thread 5/16-18 by 5/8 inch 16mm, long thread 5/16-24 by 7/8 inch 22mm, plus 5mm unthreaded center to balance bite depth in head and nut for proper clamping. 304 stainless steel construction resists rust and heat in the exhaust area, helping maintain consistent torque, limiting galling on repeated cycles, and enabling easier disassembly during routine service tasks. Exhaust flange mounting function secures flanges to cylinder heads, helps prevent gasket blowout and noise, supports muffler alignment, and suits maintenance, rebuild projects, and direct replacement of worn hardware. Garage and workshop applications suitable for home mechanics, shop technicians, and roadside fixes, includes four matching nuts for installation using basic hand tools for a quick swap during weekend work or trips.