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Option for Channel Balance.

A home owner from Livemore, CA says:
I need this channel balance -This series 390 channel balance also known as a block and tackle balance has a 26" long metal channel and is for a non tilt window. The channel's width measures 9/16" but is considered 1/2" in the trade. This balance comes fully assembled with a 15-001 shoe and a 19-002 top attached.

When I go to order, it has manditory options 2510, 2520, etc.. I cannot tell which option I should select.

The stamped number on the channel balances I am replacing is
25 5 AQ Caldwell. Would appericate your help.

Mark
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Tom from SWISCO responded:
Thanks for posting, Mark. Based on your stamp, I'd recommend our 2550 option. This can support a window sash weight range of 25 through 28 pounds. Does your sash weight fall within that range? Let me know!
A home owner from Livermore CA says:
It does and thanks for the quick reply.

Mark
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