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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.
Breather bolt for OEM backing plate on various Big Twin models from '93-99 and some Sportster models from '95-00. Replaces OEM #3577 check HD parts manual for fitment