Replacement channel balance 2820

A contractor from Florida says:
see photos the rod is 1/2'" @29 1/16" long I Have included as many photos as allowed -- so many of the end parts look alike online ( maybe add measurements to help consumers :-) ) would like to buy 2 replacements to start and if they work I will order for all the windows. The windows are original to house built in 1980, single hung single pane and are 36"x 72" if this helps.

Thank you
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hey, Claudia, thanks for posting. It looks like you have either our S390-29 or S351-29. Which of these do you think is a better match? The key is in the bottom shoe and its depth. I see you measured yours as 3/4", but it looks like you didn't account for the fins in this measurement. What is the full depth?

All measurements can be found on each product's respective page. If you notice, below the main picture are smaller portraits. If you click on these, you can see more details for that product.
A contractor from Vero beach Fl says:
Hi Tom,
Thank you for your prompt,
looks like it is the S351-29.
I placed an order for one today, we'll see how this works out and place order for rest of the windows at that time
Thanks for your help.
Profile picture of Tom
Tom from SWISCO responded:
Great, let us know how it works out!

Thank you for following up with us.
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