window parts

A quick learner from fort myers fl says:
looked at web site, have channel ballast with the number 28D on it seems tobe the same as 28'' 380 channel does this number match thanks
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Donna from SWISCO responded:
For Series 380 balances when stamped 28D the 2840 is the match, however, the 2840 stamp will be on a balance measuring 29", not 28". Check the length of the balance again, exclude the fittings for this measurement. If it is 28" in length, please remove the sash and place it on a scale for us to determine the proper stamp option for you.
A quick learner from fort myers says:
your right it is 29 in , so these are the ones I need thanks kent what is the number I need to order
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Mike from SWISCO responded:
We recommend the S380-2840.
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