Milgard Aluminum single hung window balances

A quick learner from California, Bay Area says:
I have some broken balances for these windows. I would like to identify them and place an order. The marking on the existing balance says "26 4 Caldwell HM". I am also attaching some pics. Please let me know which part number on your website I need to order.

A customer submitted photo of channel balance attachments.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! Please take a look at our S385-27 channel balance with a 2640 stamp option and let me know what you think.
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