Window Balances

A contractor from Austin, TX says:
How can I tell which series balances these are to order?
I have to get the final number from the owner, but looking to change out 9 to 18 windows. I will also need a couple caps that go on the top of the channel of the movable sash. The "metal only" is 28"

These windows are single sash, non-tilt windows.

The balance has a stamp on it "2720"
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Please see our S351-28 channel balance and 18-172 top sash guides. These look similar just looking at your pictures, but carefully go over our pictures, dimensions, and information to confirm.
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