Kinko? Window balancers

A quick learner from Orlando says:
Unknown window balancers, believed to be Kinco. Only part number on balancer is 17 2 BSI MK. I want to make sure what to hunt for as I have ~4-6 that have problems. I also identified a top sash guide 18-166 that I will be needing to order. Tx
A customer submitted image of their window channel 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 balances.

Now, as you can see, there is only one difference between these two Series, and that 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.
15-004 and 15-005
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