pivot shoe identifier

A quick learner from NC says:
May 29, 2023
Need to order pivot shoes and spiral balances. I have identified the balances but a little unsure about the pivot shoe. There is a number stamped on one of the old ones 590C. Can you identify it by this?
It appears to be 9/16 and the one I'm leaning toward is part number 15-118. Any expertise is appreciated.
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Emily from SWISCO responded:
June 1, 2023

Hello!

The 590C stamp has been associated with the 15-118 but this is by no means a guarantee. We would need to see an undamaged version removed from the window track along with the written-out thickness and width to confirm. 
Pivot Shoe, 9/16" Thick
Pivot Shoe, 9/16" Thick
15-118
$2.20
Pivot Shoe, 9/16" Thick
Pivot Shoe, 9/16" Thick
15-121
$2.37
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