The upper bearing seal comes in three sizes and is not optional when used with either a Headshok or a Lefty fork. The inner diameter is the same on all sizes, but the outer rubber cover is different. QSCSEAL, QSMSEAL, QSISEAL are the three part numbers.
- QSMSEAL – 50mm outer diameter
- QSISEAL – 58mm outer diameter
- QSCSEAL – 60mm outer diameter