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.
Parking Brake Lever Replacement
Release the parking brake lever fully.
Remove the center console.
Disconnect the parking brake switch connector (A) from the parking brake
switch (B).
...
A/T Differential Carrier Bearing Preload Inspection (A/T)
Special Tools Required
Driver Handle, 15 x 135L 07749-0010000
Bearing Driver Attachment, 72 x 75 mm 07746-0010600
Preload Inspection Tool 07HAJ-PK40201
NOTE: If the transmission housing, torq ...
Shift Lever Housing Replacement (M/T)
NOTE: Take care not to scratch the center console, dashboard, and related
parts.
Remove the center console.
Remove the harness clamps (A).
Remove the lock pin ...