Plastic part shown in the picture at the bottom corner of the sash

A home owner from Locust Grove, GA 30248 says:
I removed the lower sash on one of my windows to have the broken glass replaced. I noticed there are missing plastic (or nylon) pieces (shown in the picture of another like/same sash).
A metal rectangular piece attached to the bottom of the sash at each corner fits into the missing piece.
Thumbnail of the uploaded file named 5804AB75-5648-4D6F-AAB8-78F1F4B3164A.jpeg
Thumbnail of the uploaded file named 96725660-8F3C-4DA1-B47F-9E11815F6054.jpeg
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Bob from SWISCO responded:

Hello there. I believe this is our Series 900 Spiral Balance, which has an outer tube diameter of 3/8". For the pivot shoe, see if our 15-045 matches up; for the pivot bar, give the 26-041 a look. 

15-045 : Pivot Shoe, 3/8
Pivot Shoe, 3/8" Thick
15-045
$1.55
VIEW >
26-041 : 2
2" Pivot Bar, Keller
26-041
$1.32
VIEW >
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