Chevrolet 1999 Corvette Owner's Manual page 290

To install the new wiper insert:
1. Slide the insert (D), notched end last, into the end
with two blade claws (A). Slide the insert all the way
through the blade claws at the opposite end (B).
Plastic caps (C) will be forced off as the insert is
fully installed.
2. Be sure the notches are locked by the bottom claws.
Make sure that all other claws are properly locked on
both sides of the insert slots.
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3. Put the blade assembly pivot in the wiper arm hook. Pull
up until the pivot locking tab locks in the hook slot.
4. Carefully lower the wiper arm and blade assembly
onto the windshield.
Installation guide:
A. Claw in Notch
B. Correct Installation
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C. Incorrect Installation