Need Anderson slim ballasts

A handy person from Pittstown, NJ says:
October 22, 2020
I have 2 different size windows at the moment that I would like ballasts for.
I have not found the numbers on line.
one window has both a 11600-17 and 11600-3 its a 37.5 x 24 J39-519 10-87
window.

The other is a 62x40 and it is a P78 12#31 1-86 I assume the last 10-87 and 1-86 are manufacture years.
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A handy person from Pittstown, NJ says:
October 22, 2020
Turns out , I also need the material in the groove that helps the window seal and glide. See pic.
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Tom from SWISCO responded:
October 27, 2020

For your balance stamped "519," I recommend the 24-531. For the balance stamped 12#31, I recommend the 24-1231, perhaps unsurprisingly.

I'm not sure about that seal. Can you remove an undamaged sample and show me a clear view of its end profile?
A handy person from Pittstown, NJ says:
October 27, 2020
I will have to remove the window again.
It's the seal that slides on the thin protrusion. Its what guides the window up and down.
It's a slippery type of material, with a foam interior.

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Tom from SWISCO responded:
October 28, 2020

That sounds like just about every weatherstripping there is. We'll definitely need to see the end profile. The video below will clarify for you exactly what we need.
Andersen Sash Balance, 1226, 1227, 1231
Andersen Sash Balance, 1226, 1227, 1231
24-1231
$54.20
Andersen Sash Balance, 519, 523, 525, 527, 531
Andersen Sash Balance, 519, 523, 525, 527, 531
24-531
$54.20
Identifying Replacement Weatherstripping
Identifying Replacement Weatherstripping
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Andersen's Narroline Sash Balances
Andersen's Narroline Sash Balances
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