plastic pin insert for storm window frame

A quick learner says:
The pin broke off one side. So I am seeking a replacement part. Plastic insert into storm window frame, the extruding pins on either side fit into the grooves on the door frame allowing it to slide up and down. The frame is aluminum, pretty old.
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Bob from SWISCO responded:

This looks very similar to our 95-073 Corner Tilt Key. Please compare the dimensions we list and see if you think this matches up. 

A quick learner says:
Thanks Bob, 95-073 Corner Tilt Key does indeed look similar. To validate the size I need to remove the broken one from the frame. Do you have any tips or suggestions on removal/replacement?
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Bob from SWISCO responded:

We don't have a video on this corner in particular, but we have a photo on general corners that work the same kinda way. It may be of some help to you.

How to replace stamped window corner keys.
How to replace stamped window corner keys.
VIDEO
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