Pontiac 1999 Firebird - Manual (Page 293)

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Wiper Blade Element Replacement
To replace the wiper blade element, follow these steps:
1. Locate the heel end of the wiper blade assembly that
has the two notches held by the wiper blade claw.
2. Hold the wiper blade assembly with one hand and
pull the element gently with the other hand.
(Replacement blade elements have three plastic caps
which retain two metal strips. Do not remove these
caps before the element is installed).
3. At the heel end of the wiper blade assembly, notched
end of blade element last, slide the blade element
into the blade claw sets. The plastic retainer caps
will be forced off as the element is fully inserted.
Make sure that all the claw sets are properly engaged
in the slots of the blade element.
4. Install the wiper blade assembly on the wiper arm.
For information on wiper blade replacement length and
type, see “Normal Maintenance Replacement Parts” in
the Index.