Window Channel Balance ID

A home owner from Bokeelia, FL says:
The markings on the existing hardware I took out are 2090 32 pf. I have also attached a photo that gives a descriptive of the windows size.
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Bob from SWISCO responded:

Thanks for posting. Based on the characteristic nylon attachments this looks like either our Series 351 or Series 390 channel balances.The only difference between the Series 351 and Series 390 is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Below are the dimensions of each respective shoe. Compare with your old balances and see what you think matches best.

You will need to measure the length of the metal channel, not including the nylon attachments, to determine the balance length you must select. Finally, the stamp code 2090 is for a rating system we no longer use. To know which stamp option to select, you must weigh your window sash. That precise weight should correspond with one of the stamp options listed on the product page.

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