Subaru 2005 Legacy Owner's Manual page 326

Grasp the dual cupholders' divider plate at the base.
Turn it counterclockwise to remove it.
If you hold the divider plate at the top while
turning it counterclockwise, it may break.
To use again as cupholders:
Insert the protrusion on the back of the divider plate
into the hole in the center of the console box. Grasp
the divider plate at the base, and turn it clockwise to fit
it.
If you hold the divider plate at the top while
turning it clockwise, it may break.
Interior equipment
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