window channel balances - which one?

A home owner from Calgary, Alberta says:
July 26, 2014
Hello I recently moved into a house with a single hung window with both channel balances missing. I have removed the sash and it measures 34" x 35" with the visible window pane to be 30.75" x 31.5".

I don't see any label that indicates the manufacturer of the window.

With the variety of channel balances options, could you help me pick a pair that will work for my window?

Thanks,
User submitted photos of a window balance.
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Paul from SWISCO responded:
July 28, 2014
I see you have another window next to this one. Does that other window have balances? If so, let me see a picture of those removed from the window. Otherwise, I am not sure what Series would work for you. It is very difficult to identify a balance Series without having the original balances on hand.
A home owner from Calgary AB says:
July 28, 2014
Unfortunately the other window cannot be opened.
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Paul from SWISCO responded:
July 29, 2014
In that case, the best I can do is offer you an educated guess. I recommend that you consider our S390-33 channel balance with a 3220 option. Two balances with this option can carry a window sash weight of 13 through 18 pounds.
5/8" Top Sash Guide
5/8" Top Sash Guide
18-008
$0.95
Take Out Clip
Take Out Clip
16-002
$0.41
33" Series 390 Channel Balance
33" Series 390 Channel Balance
S390-33
$11.52
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