replacement spiral tilt window balance

A home owner from VA says:
Here are pics of what I have - one is missing the white plastic part that holds the piece in the window channel. I would just like to replace both so they match - what do I need? The engraving shows 26C BS1. Thank you so much!
Thumbnail of the uploaded file named window sash.JPG
Thumbnail of the uploaded file named ws2.JPG
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Tom from SWISCO responded:

Sure, we can replace this balance, but it seems yours has a hook at the top. That means this has to be a custom assembly. We would use our S795-26 but install a 15-198 hook on top.

If that sounds good to you, please tell me how many you wanted to buy and I will email you a purchase link and price quote for that quantity.

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