CRL ALUM-FA2930GW-VCP-1 2930 Channel Balance

A quick learner says:
I purchased a replacement window guides a couple of years ago the part #CRL ALUM-FA2930GW-VCP-1 2930 Window Channel Balance with FS293BA Guides Attached was I need to order one more pair (2 each of these and I also need to order a pair but instead of being 27" I need one that is 31 inches as that is what my channel measures. The two sizes look identical but they are different lengths. Can you provide your part number for the part number above and the part number for the 31 inch.

Thank You! m
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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-31 , with a 15-002 bottom attachment, or S390-31 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

You'll also need to locate the stamp code printed on your 31" balances to choose the corresponding spring strength options for your replacement balances. Thank you!

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A home owner from N/A says:
What is your part number for this channel balance that is 27" #CRL ALUM-FA2930GW-VCP-1 2930 Window Channel Balance with FS293BA
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Casey from SWISCO responded:

The 27" versions of these balances would be either the S351-27 or S390-27 but you'll still need to measure to choose between the two. 

Also, please note that 2930 would be for a 30" balance. The 27" channels should have their own stamp that you'll use to choose the corresponding strength options. 

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