Channel Balance Sizes for old Vista Deluxe Windows

A quick learner from Oakland, CA says:
Hi,

I'm looking to replace broken channel balances for 4 windows.

16 inch length
9/16 or 1/2 width

The only listed part # or id on the balance is 15 D. Attached picture details of the top, bottom and the part #.
Thumbnail of the uploaded file named Top.jpg
Thumbnail of the uploaded file named Bottom and Clip.jpg
Thumbnail of the uploaded file named Part Size 15 D.jpg
Thumbnail of the uploaded file named Side View Bottom.jpg
Thumbnail of the uploaded file named Side View Top.jpg
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Bob from SWISCO responded:

See either our S351-16 or S390-16 Channel Balances. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 1540. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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