This part is a replacement stabiliser hook that is used with key caps for keys that have stabiliser bars on keyboards with ALPS keyswitches.

Example keyboards that use this part: Apple Extended Keyboard II Apple //c keyboard - memory expansion model Apple IIgs keyboard - Apple part number 658-4081

This model is not as thick as the original part and has been designed for easy printing and minimum volume. It performs the same as the original part in my limited testing.