Subaru 2003 Baja - Manual (Page 290)

BAJA U.S.A..A2310BE–A
9-16
HB9077BA
2. Remove the rubber cap from the cargo bed. Store the rubber cap
in a safe place. Pay attention not to lose the rubber cap after removal.
HB9062BB
3. Place the flat tire in the cargo bed with the outer side of the wheel
facing up. For an aluminum wheel, remove the center cap before
placing it in the cargo bed.
4. Place the retainer on the center hole of the wheel as illustrated and
put the tire holding rod into the retainer.
If the flat tire is separated from its wheel completely, the retailer
should be placed upside down on the wheel.