The sealing rings are synthetic resin with chamfered ends. Check the condition of the sealing rings, and replace them only if they are worn, distorted, or damaged.
For a better fit, squeeze sealing rings together slightly before installing them.

Apply ATF to the new sealing rings, then install them on the secondary shaft.

After installing the sealing rings, verify the following:
The rings are fully seated in the groove.
The rings are not twisted.
The chamfered ends of the rings are properly joined.
Tire Pressure Monitoring System (TPMS) - Required Federal Explanation
U.S. models
Each tire, including the spare (if provided), should be checked monthly when
cold and inflated to the inflation pressure recommended by the vehicle
manufacturer on the vehicle placard o ...
Replacement (Part -1)
Remove some of the brake fluid from the master cylinder.
Raise and support the vehicle.
Remove the front wheels.
Remove the brake hose mounting bolt (A).
...
ATF Replacement (A/T)
NOTE: Keep all foreign particles out of the transmission.
Warm up the engine to normal operating temperature (the radiator fan
comes on), and turn the engine off.
Raise the vehic ...