Subaru Legacy BN/BS (2015-2019) Owners Manual: Storing in the spare tire compartment (Legacy)

Storing a flat tire

...

Storing with the tire bag (Outback)

If your vehicle has wheel covers, keep the wheel cover removed.  Take out the tire bag and tire fixing band from the under-floor storage compartment. For details, refer to "Outback" ...

Other materials:

Key replacement
Your key number plate will be required if you ever need a replacement key made. Any new key must be registered for use with your vehicle's immobilizer system before it can be used. The maximum number of keys that can be registered for use with one vehicle is as follows.  Four (model ...