Caldwell 28" Channel Balance Replacement - 2740 BSI PD (no wings)

A purchasing agent from Dublin, CA says:
Hello,

I need to purchase a bulk quantity of 28" channel balances to repair our school windows. May I ask you to help me figure out the proper part #?
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Tom from SWISCO responded:

Hello again! This balance is a little different compared to your other balance, not just in terms of size. This one doesn't have those same wings on the nylon fittings. With that in mind, consider our S390-28. This has a 19-002 top and 15-001 bottom. Like before, see how well those match up to confirm.

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