Need window balance channel

A quick learner from florida says:
the number on my old part is 1220
measurements for metal part only.... not including the plastic :
12 1/2 inches long
9/16 wide
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Emily from SWISCO responded:

Hi there!

We can help but I'd like to see close up pictures of your top fitting from a few different angles. That will help me determine what kind of balance you'll need. 

Your metal channel should also measure as 13" so we suggest triple checking that measurement to confirm. 

A quick learner from florida says:
hello,
I am confirming that my part measures: 13 inches. not including the plastic attachments but I can use the 13 inch if that is all that I can get.

see additional pictures
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Emily from SWISCO responded:

Thanks for confirming! These pictures appear to be the same ones in your initial batch of pictures, however. We'll need to see up close pictures of your top fitting from a few angles in order to determine a match.  

A quick learner from florida says:
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Emily from SWISCO responded:

Thank you! This looks like a good match for our S377-13 with the 1220 spring strength option. Look over our specifications and see what you think.

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