Subaru Outback 2015 Manual page 520

2. Pull the blade rubber assembly out of
the plastic support.
1) Metal spines
3. If the new blade rubber is not provided
with two metal spines, remove the metal
spines from the old blade rubber and
Maintenance and service/Replacement of wiper blades
install them in the new blade rubber.
4. Align the claws of the plastic support
with the grooves in the blade rubber
assembly, then slide the blade rubber
assembly into place.
Securely retain both ends of the rubber
with the stoppers on the plastic support
ends. If the rubber is not retained properly,
the wiper may scratch the rear window
glass.
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