This seal kit includes the base seal and two piston seals for our FF1600 Hydraulic Release Bearing Kit, Part No. 163-55.
If you find that you have to replace these seals frequently, check the condition of the piston and try a new Replacement Bearing for FF1600 Hydraulic Release (Part No. 163-61, sold separately). When this bearing starts to wear out, it seizes and spins the piston, which can cause the seals to pull out of the bore. If this goes on too long, the piston can spin enough that deep grooves can be gouged in it. A grooved piston will not seal, even with new seals.