Window replacement part

A quick learner from USA says:
The windows in question were mfg and installed in the latter part of 1983. There are no numbers, markings, etc. on any of the parts that I can see except for the name Certainteed stamped on the white plastic window pivot piece.

#3678 show the entire window pivot asm, (both upper and lower sections) with the broken piece on the bottom part of the spring asm.

# 3681 shows a closer view of the broken piece

# 3683 shows the metal piece located on both sides of the bottom sash which fit inside of the round piece that is broken.

#3690 shows the broken round piece removed from the pivot window asm.

thanks in advance for your help.
User submitted photos of window hardware.
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Tom from SWISCO responded:
Thanks for posting. The damaged hardware in your pictures is known as the pivot lock shoe. It's tough to make yours out while it's still installed, but I think it may be like our 15-155. Check it out and let me know if this would make a good match. If not, please show us a picture of it out of the window and we can try our best to find something better.
A quick learner from columbus, oh says:
Do you have a quick tutorial on HOW to remove the pivot lock shoes from the casing?

I tried briefly but didn't want to do additional damage which would require more repair.
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Tom from SWISCO responded:
We sure do. Refer to the videos below, I think they should help.
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