Subaru 2004 Impreza Owner's Manual page 358

Sedan: Remove the floor cover from the trunk. Re-
move the storage compartment (if so equipped).Turn
the attaching bolt counterclockwise, then take the
spare tire out.
Wagon: Open the lid and hang the hook provided on
the under side of the lid on the rear edge of the roof to
keep the lid open.
Remove the storage compartment (if so equipped).
In case of emergency
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