Aluminum double hung sash

A home owner from Central SC says:
33 x 65
installed 2003
stamped on balance 34C ml BSI
Window manufacturer unknown

I am also looking for a bottom gasket
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Paul from SWISCO responded:

Thanks for posting! Please see our Series 770 channel balance, I think you'll find this matches yours quite well. If you also need a pivot shoe, see our 15-129.

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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