Model With Side Turn Signal Light

WARNING: This page is about a different car, the 2007 Subaru Outback and 2007 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Locating Upper Side Clips From Inside Of Outer Mirror
Courtesy of SUBARU OF AMERICA, INC.
Pull the scalp cap forward of outer 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 the outer mirror and push the upper clips (A) in.

Fig 3: Identifying Lower Hooks Of Scalp Cap
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.