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.
Under-Cowl Panel Replacement
NOTE: Take care not to scratch the body.
Remove these items:
Windshield wiper arms
Cowl cover
Remove the bolts, then remove the under-cowl panel ...
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).
...
As required by the FCC
1)This device complies with Part 15 of the
FCC Rules and Canadian RSS-210/RSSGen.
Operation is subject to the following
two conditions: (1) this device may not
cause harmful interference, and (2 ...