Need Help Identifying Proper Replacement Pivot Shoe

I am looking to replace the pivot shoes on a couple of my windows which have cracked and no longer hold the spiral balance pins.

The dimensions of my current pivot shoe is as follows:
Thickness: 1/2 in
Height: 2 in
Width: 1 1/4 in

The only marks on the shoe is the number 21.

The current shoe does lock when the window is tilted out.

Ideally I would like to not have to replace the bar if possible so I included images of that as well.

From looking at the parts on your site, I would guess that 15-188 "PIVOT LOCK SHOE, 1/2" THICK, BLUE BREAK" is the best fit.

A couple others that I thought might work are 15-046 although that would definitely require new bars or 15-135 although that looked like it doesn't have any reinforcing metal to hold the balance pins.

I appreciate your help.
Thanks, Don