S751 with 15-233 shoe

A quick learner from usa says:
Can you get a quote for a balance S751-37 custom ordered with shoe 15-233 instead of the stock shoe?
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Tom from SWISCO responded:

Sure, that's no issue at all. I just need to know the stamp printed on the original, as well as how many you wanted to purchase.

A contractor from USA says:
See attached. the balance lengths are different for the top and bottom
Thumbnail of the uploaded file named photo_2021-01-13_13-02-58.jpg
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Tom from SWISCO responded:

Can you confirm that the lengths are different? Both the top and bottom sash appear to have a 26TG stamp, which indicates a metal channel length of 37". Note that this is different then the 37" length you gave me before.

I also still need to know quantity.

A contractor from USA says:
We would need 2 pairs of 27" and 4 pairs of 28''
A contractor from USA says:
There are top and bottom signifiers on the balances, so the manufacturer must use a different code system that correlates to the length? Not sure. I did think it was unusual that the balances were different lengths with the same number.

2 pairs of the 26TG and 4 of the 27TG
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Tom from SWISCO responded:

Thanks for confirming. I will email you two purchase links right now for those sizes. We'll be sending you 4 of the 26TG and 8 of the 27TG. Let me know if you had any follow up questions.

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