This viton base o-ring fits 3-3/4, 3-7/8, and 3.927 inch bore cylinders for 1999-11 Harley-Davidson® big twin engines. Two required for an engine.
Harley-Davidson® part number 11256.
Note: All reference to H-D® part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle's products are original equipment parts or that they are equivalent to the corresponding H-D® part number shown.