30" channel balance

A quick learner from California says:
It was stamped with 29 3 JW CMC 11, would you know the equivalent replacement? It seems the 380 with 15004, I assume those are pre assembled with 15005, are those easy to replace?
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Tom from SWISCO responded:
I cannot determine the Series of your balance based on this information. All the stamp tells us is the length (30") and the strength of the spring (our 2930 stamp option). The only way to confirm what Series you have is to match up the nylon attachments that come with each of our Series to your own measurements.

See our video on how to replace this hardware.
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