Viking Window balance

A quick learner from Nampa Idaho says:
House was built in 1993. Has Viking windows. Part number 2690EE28
Can send more pictures if needed. Need replacement parts for two windows exactly the same size. Length of bar is 28 inches
Thank you
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A quick learner from Nampa Idaho says:
In case you needed more photos
Thank you
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Emily from SWISCO responded:

Hi there!

It looks like you have our Series 395 channel balance. You'll also need to remove your sash and weigh it to choose the appropriate spring strength option. There's a chart on the Series 395's product page that shows you which option you'll need based on the weight of your sash. 

If you have any further questions just let us know. 

A quick learner from Nampa Idaho says:
Since I am by myself I do not feel comfortable taking the sashes off to weigh them. I did clean up the metal bar and found some more initials. Not sure if they can help identify the weight or not. Sashes are vinyl. Thank you for your help
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Emily from SWISCO responded:

I'm afraid the stamp on your balance is outdated and doesn't tell us what spring strength you need. If you're not comfortable with removing the sash yourself, a professional should be able to help. I'm sorry we can't offer a better solution.

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