Channel guides.

A quick learner from Austin Texas says:
Need help in finding the proper guides. Windows are all the same height from frame to frame edge.

The top side is pointed with tiny wings. The bottom. Edge rounded.
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Tom from SWISCO responded:

Hello! Sounds like you're talking about the bottom balance fittings. The one in your photos is the bottom shoe, either the 15-001 or 15-002 depending on depth. Review their specs to see which one is a closer match.

You also mention a top fitting but I don't see it in your photos. There are a ton of different possibilities so I need to see it before I can make a recommendation.

It is possible to replace these fittings and reuse the balance and I'll share instructions on how you may do so below. However, keep in mind that when these fittings break, the balance is usually not far behind. In all likelihood you will have to replace the whole thing.

A quick learner from Austin Texas says:
The stamp on the device is 2740 BSI with a cl below that.

Here are more photos as requested.

They are only on the bottom panes. The string rigging in them has popped.
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A quick learner from Austin Texas says:
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Tom from SWISCO responded:

If the string has popped then replacing the top and bottom fittings alone won't solve the problem. You need all new balances.

Based on these new photos I think there's a good chance you have our S395-28. This comes with a 19-005 top fitting and 15-001 bottom fitting pre-attached, but you should review both of these pieces to ensure they're the same as what you have now. I think they will be, but it never hurts to check.

A quick learner from Austin Texas says:
Thank you - yes I was looking for a total replacement versus repair. Just wanted to describe as much as possible.

To ensure the proper length - it looks like 28" - measure ONLY the metal part end to end correct?
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Tom from SWISCO responded:

Yes, that's 100% correct. You only measure the metal channel. Based on your stamp it should be 28" long.

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