Are channel balances ready for use!

A handy person says:
Hi there:
Based on the measurements and the sashes, I believe the replacement will be the S380-21 series. I have two questions. Will this replacement channel balances fit the Milgard windows? If it does, will it come fully assembly and ready for use?

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Tom from SWISCO responded:
Thanks for posting, De. I've seen other customers use our Series 380 channel balances for Milgard windows in the past, but that doesn't necessarily mean that the S380-21 will work for you. What's most important is making sure the nylon attachments, metal channel, and stamp option match what you had originally installed. Our balances do come fully assembled and ready to go.
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