Milgard Channel Balance replacement

A quick learner from USA says:
29 9

30" total length
Milgard aluminum single hung dual pane window with grid

The sash is 29.8 lbs
I need 12 balancers
User submitted photo of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. It looks like your bottom attachment has wings while your top attachment doesn't. That would match our S350-30 channel balance. Look it over and tell me if you agree. For a sash weight of 29.8 pounds, I recommend our 2950 option.
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