Subaru 2005 Legacy Owner's Manual page 577

Maintenance and service
2. Wrap tape around a flat-head screwdriver, then in-
sert the screwdriver into the gap A between the side
cover and rear combination lamp and use it as a lever
to undo the clip. Undo clips C and D in the same way,
then remove the side cover.
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3. Remove the upper and lower screws. Then, slide
the rear combination lamp assembly to the rear and
remove it from the vehicle.