O-ring. This is a direct replacement for Harley-Davidson part number 17955-36. 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. S&S Part #: 106-3849
Fitment: Classic Pre-1984

Cross-Reference: The following OEM numbers are provided for reference only and may not be completely accurate.
Harley OEM Cross Reference Numbers:
17955-36