Window Counter Balance

A home owner from Boynton Beach Florida says:
Attached are five photos (end caps) for the window counter balances I would like to replace. The channel is 1/2" wide and 30" long. For your reference the number stamped on the channel is 1 29-5 which probably translates to 1/2" wide X 30" lg. channel.

Please let me know which replacement to choose. I'm committed now as channels are out laying on my workbench.
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Tom from SWISCO responded:

It appears you have our Series 377 balance with a 2950 stamp option. Take a look at this product and see if it will work for you.

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