Unidentified Alenco Channel Balance

A landlord from Denver, Colorado says:
This for an Alenco single hung window. Date of construction is 1984. The length of the metal "channel" is 28 1/16". While it is 9/16 wide I understand you call this a 1/2" channel. The number 27 B is stamped on the shoe end of the channel. I need the entire channel mechanism, not just the shoes as foe some reason one channel is missing. Let me know if you need additional information or photos. Thanks for your help.

My name is Mike
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
15-001 and 15-002
A quick learner from Denver says:

Did you see my response of yesterday where I indicated the distance of the 15-001 was correct, but my shoe does not appear to have "wings" on it?
Profile picture of Tom
Tom from SWISCO responded:
I'm sorry, I did not see that question. It may not have gone through.

Are you referring to how your shoe is solid while ours has ridges? I don't think that will matter, as long as the dimensions are otherwise identical.
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