What option for a 33.3 pound sash?

A quick learner from San Jose says:
It seems that I need the 26" Series 385 Channel Balance with 19-005 top and 15-004 shoe. What is not clear is what option I need to select. Slash weight is 33.3 lb. Can you help me out.

BTW: the difference between the 15-004 and 15-005 shoe is very subtle, correct?

FYI: Current hardware shows 25 9 KU CMC 2 as label.
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Tom from SWISCO responded:
We can custom make this for you with a 2570 option. Two S385-26 balances with a 2570 option can carry a sash weight of 33 through 36 pounds. Would that work for you? If so, how many would you need?

Yes, the difference is between their depths. You can see our dimensions for each part on their respective store pages.
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