Mazda 6 Manual page 458

Maintenance and Care
Owner Maintenance
5. Remove the metal stiffeners from each
blade rubber and install them in the
new blade.
CAUTION
Ø Do not bend or discard the
stiffeners. You need to use them
again.
Ø If the metal stiffeners are
switched, the blade's wiping
efficiency could be reduced.
So do not use the driver's side
metal stiffeners on the passenger's
side, or vice versa.
Ø Be sure to reinstall the metal
stiffeners in the new blade rubber
so that the curve is the same as it
was in the old blade rubber.
6-36
6. Carefully insert the new blade rubber.
Then install the blade assembly in the
reverse order of removal.