Breather Bolt

HARDDRIVE Breather Bolt Restore proper ventilation and OEM fit — the HARDDRIVE Breather Bolt is a direct replacement for the original equipment breather bolt used on various Harley-Davidson Big Twin models (1993–1999) and select Sportster models (1995–2000). Direct OEM replacement — replaces OEM part #3577 for a precise fit on backing plates Corrosion-resistant construction — durable metal finish designed to withstand heat and road exposure Easy installation — slip-in fitment to factory locations; no modifications required Maintains engine ventilation — ensures proper breather function to help reduce pressure build-up and oil leakage Always confirm fitment with your factory parts manual or vehicle application guide before ordering. Ideal for maintenance, restoration, or upgrading worn breather hardware.