Ring sets include cast iron compression rings and three-piece flex-vent oil rings. Sets are for two pistons. 1000cc:. Fits 72-E85 Sportster. 1200cc Evolution:. Hastings #6164 replacement rings for O.E.M. pistons have 5/32" oil rings. Standard bore is 3.4978". Fits 88-03 Sportster.
Fitment: 1000cc, +.010", H-D#22357-72TA