Milgard window completely with out balances

A quick learner from Tacoma, WA says:
I provided pictures of the bottom corners of the window, measurements of anything on the window or the casing that I could think of, but alas, there is no balance to compare to for replacement. What is your recommendation for my next step?
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Paul from SWISCO responded:

It will be very hard to identify what you need without the original balance to use as a reference. I can tell you that many Milgard windows have used our Series 385; this comes with a 19-005 top and 15-004 bottom nylon fitting fittings attached. From your photos, it looks like this could potentially be our S385-12, but you need to weigh the sash to determine the proper stamp option. Also keep in mind that the S385-12 is an educated guess. We cannot guarantee that this will work.

A quick learner from Tacoma, WA says:
So when I click to see the S385-12, the options are the weight of the sash? The price is affordable enough, I wouldn't be upset if it didn't work.
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Bob from SWISCO responded:

Correct. If you look further down on the product page, you will see a chart that lists the weight range for each stamp option. You want to choose the stamp option with the weight range that your window sash falls into. If the balance is too weak or too strong for your window sash, the balances will not perform correctly. Be sure to get the exact weight.  

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