Need replacement parts to fix tilt-in window.

A home owner from Suffolk Va says:
The stamp on the metal channel part is 28C PV BSI
Window manufacturer is unknown.
Need to know what parts I need to totally replace with new parts. (Plan to replace both sides. Thanks!
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Tom from SWISCO responded:

Thanks for posting. This balance looks like our S795-28, though it looks like your bottom T shoe has an open cam. I think our S795-28 should work, but you'll also want to purchase our 15-195B separately and swap them out upon arrival. Refer to the video below to see how this is done. It's very easy.

Also keep in mind that our S795-28 installs at the top using a screw tab, not a hook. It looks like yours also uses a screw tab, based on your first photo, but it's admittedly hard to tell for sure.

How to Install a T-Lock Shoe on a Channel Balance
How to Install a T-Lock Shoe on a Channel Balance
VIDEO
WATCH >
How to Convert a Crossbow Balance to a Channel Balance
How to Convert a Crossbow Balance to a Channel Balance
VIDEO
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How to install the 26-200 Screw Plug
How to install the 26-200 Screw Plug
VIDEO
WATCH >
Modifying the Series 795 Balance
Modifying the Series 795 Balance
GUIDE
READ >
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
READ >
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