2840 DL Balance Channel replacement

A quick learner says:
I need to replace my Channel balance and need to make sure I get the one with the correct ends. I have attached pictures of each end. On the channel itself, it has the number 2840 DL listed.

Can you please help me get the right channel balance?

Thanks
Dan
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 380 or our Series 385.

Now, as you can see, the only difference between these two Series is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. 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.
Comparison of 15-004 and 15-005
Comparison of 15-004 and 15-005
A quick learner says:
I have narrowed it down to the 15-004.

Thank you!
A quick learner says:
Does it matter that they have BSI stamped on the channel? I hope not, I just placed my order.
Profile picture of Tom
Tom from SWISCO responded:
No, that just let's us know who made the balance. If everything else matches up it shouldn't matter.
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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