Outer Mirror: Replacement

Face the mirror upward.
Use a flat tip screwdriver to remove clip (A).
Lift the lower mirror up to remove hooks (B).

Fig 1: Lifting Lower Mirror Up To Remove Hooks
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the mirror heater connector from the end of mirror. (Model with mirror heater)

Fig 2: Disconnecting Mirror Heater Connector From End Of Mirror
Courtesy of SUBARU OF AMERICA, INC.
Catch the hooks (A) and install clips (B).

Fig 3: Catching Hooks And Installing Clips
Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

When removing the mirror, be careful not to damage the back side of mirror with a flat tip screwdriver.
When installing the mirror, insert the hook and clip securely.