Which one do I order?

A home owner from Plant City, Florida says:
February 4, 2011
I need to replace several channel balances on the windows in my house but can't determine the correct one to order based on the pictures on your website. It seems there are several different ends for the same basic balance. My balance is 23" long, 1/2" wide and 9/16" deep. I sent some pictures to swisco.com yesterday.
User submitted image of channel balance and attachments
Profile picture of Paul Sr.
Paul Sr. from SWISCO responded:
February 7, 2011
Thank you for submitting your photos.

Are there any markings on the balance?
A quick learner from Plant City says:
February 7, 2011
Yes there is a number. 2240Z.
Profile picture of Donna
Donna from SWISCO responded:
February 7, 2011
Looks like Balance Series 390.
Here is a link to get you started:

23 inch Series 390

and choose stamp option 2240
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