16 4 RY Caldwell or 16 3 AW 3MC 4 (?)

A quick learner from Prineville Oregon says:
I need to replace one broken window sash part. The set I have appears to be two different manufacturers. The broken one says Caldwell. Thank you.
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Emily from SWISCO responded:

Hello there!

With this combination of attachments, you could have either an S380-17 or S385-17 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. For the balance marked "16 4", you'll need a stamp option of 1640. As for the other balance, it looks to be marked "16 3", but it's hard to tell. If you're unsure, you can always weigh your sash on a scale to determine the appropriate stamp option.

If you have any further questions just let us know! 

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