Window Counter balances

A contractor from Western MA says:
February 23, 2021
I looked under nontilting counter balances but am not seeing a matching part number. By my photos is something, can you tell if you would stock this part? I am not sure the make or year of the windows. They are aluminum, channel is 9/16th wide, non ribbed.
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Tom from SWISCO responded:
February 24, 2021

Thanks for your photos. Based on what I see here, you have either our S351-35 or S390-35, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A contractor from Western MA says:
April 18, 2021
I ordered the 390-35 and they seem to work. Thank you for that. Now I am looking for the top sash guides that work with that counter balance. I ordered the 18-009 and the screw hole doesn't line up. Do you have another guide that would work? I am also looking for the "foot?" that attaches to the bottom shoe of the counter balance.
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Tom from SWISCO responded:
April 23, 2021

Your top sash guide looks like a better match for our 18-107. See what you think.

I'm afraid that we don't have that other piece you show, unfortunately. What is its function?
A contractor from Western MA says:
May 2, 2021
The sash guides I ended up ordering were the 18-108 Alsco. Believe those are exactly the ones I need. I am not sure what the function of that piece is...possible just to block the opening on the side of the window sash?
5/8" Top Sash Guide
5/8" Top Sash Guide
18-009
$0.99
Top Sash Guide Pair, Sugarcreek
Top Sash Guide Pair, Sugarcreek
18-107
$3.75
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