Sash Balance Marked 28 2 Caldwell AN

A quick learner from Melbourne,FL says:
I need to replace a Sash Balance marked "28 2 Caldwell". From a previous posting with photos it appears to be the following:

* 29" Series 390 Balance, with the 19-002 Top and 15-001 Shoe attached

If so, what option is correct? Option 2820?

Thanks!
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Mike from SWISCO responded:
Caldwell makes many different style balance so you need to make sure your balance attachments match to the ones in the S390-29 product picture. If you they do not or you are not sure, send us photos of your balance.

If you do have the S390-29, choose option 2820
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