Need window channel balancers

A home owner from Olathe, Kansas says:
The balancers I need have the numbers:
1530 (need 6)
And 3030 (need 2)
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Bob from SWISCO responded:

I am certain we can help, but these stamp codes only tell us the spring calibration inside the balances. To know what Series you need, we need pictures of the nylon fittings on either end of the metal channels. From there we'll do our best to help. 

A home owner from Olathe, Kansas says:
I have freed up most of the ones but I still need two that measure 31-1/8" end to end of the metal. (does not include the plastic parts).

Thanks,
Henry
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Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:

I believe you have either an S351-31 or S390-31, the only difference between these two balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 3030. 

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