Model With Side Turn Signal Light

Remove the mirror. < Ref. to REPLACEMENT , Outer Mirror. >
Press-in the upper side clips (A) from inside of door mirror.

Fig 1: Press-In Upper Side Clips From Inside Of Door Mirror
Courtesy of SUBARU OF AMERICA, INC.
Pull the scalp cap forward of door mirror, remove the upper side clips (A) and lower side hooks (B), and then remove the scalp cap.

Fig 2: Removing Upper Side Clips And Lower Side Hooks
Courtesy of SUBARU OF AMERICA, INC.
Insert the lower hooks (B) of scalp cap to door mirror and push the upper clips (A) in.

Fig 3: Inserting Lower Hooks Of Scalp Cap To Door Mirror
Courtesy of SUBARU OF AMERICA, INC.
Install the scalp cap securely.

CAUTION: Do not remove the scalp cap forcibly. The lower hooks may be damaged.