What option do I choose for a 26 4 FL CALDWELL stamp?

A home owner from Romeo, MI says:
My original window channel balance has 26 4 FL CALDWELL printed on it. What option do I choose when buying your window balance?
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Tom from SWISCO responded:
A "26 4" stamp usually corresponds to our 2640 option, but you can always weigh your sash to confirm if you still aren't sure.
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