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DEALER PACKS..... Replacement for Harley-Davidson O-rings part #11105 for Oil, Transmission and Primary "Drain Plugs" These are Viton O-rings from HDsmallPARTS LLC. You will receive 100 pcs. They are used on Twin Cam engine oil, transmission and primary drain plugs on most late model Harley's. They resist chemicals and oil better than the cheaper Buna-N O-rings being sold. You can buy cheaper O-rings, and change your oil every 3000 miles which requires more work, and more money on oil. First Class shipping in a padded mailer with a tracking #, NOT a letter envelope without tracking. Check your manual to be sure H-D replacement part #11105 is what you use. These replacement O'rings are the same exact size.