Replace channel balance

A quick learner from Bel Air Maryland 21014 says:
January 26, 2020
The stamp on the side says 30 3 Caldwell DM The metal channel is 31" long not including the plastic ends. What replacement part do I need to order?
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Casey from SWISCO responded:
January 28, 2020

Have a look at our S380-31 channel balance. This comes assembled with a 19-005 balance top and 15-005 bottom balance shoe. You will need to make sure your 'depth; measurement matches up to the 15-05. If everything looks correct, then you can go with the 3030 option that holds a sash weight of 16-23 pounds. 
31" Series 380 Channel Balance
31" Series 380 Channel Balance
S380-31
$11.30
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