Side Retainer

Remove the O-ring.

Fig 1: Identifying O-Ring
Courtesy of SUBARU OF AMERICA, INC.
Remove the oil seal.
NOTE:
- Remove it by using flat tip screwdriver.
- Do not reuse the oil seal. Replace the oil seal with a new part.
  
  Fig 2: Removing Oil Seal
  Courtesy of SUBARU OF AMERICA, INC.