Replacing two different size channels

A home owner from Stow, MA says:
February 28, 2021
I need to replace several window channels. They are all 1/2" wide, some 29" long and some 32" long. The number 2810 is on the shorter ones and 3210 is on the longer ones. (pictures attached)

I would also like to replace the metal clips (stops window when pushing up. (picture attached)
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Bob from SWISCO responded:
March 2, 2021

I believe you have our S370-29 channel balance, with a stamp option of 2810, and our S370-33 with a stamp of 3210. Compare both with your old hardware to see if this matches what you need. For the Take-Out Clips, see our 16-002. 
Take Out Clip
Take Out Clip
16-002
$0.41
29" Series 370 Channel Balance
29" Series 370 Channel Balance
S370-29
$11.27
33" Series 370 Channel Balance
33" Series 370 Channel Balance
S370-33
$11.80
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