window balance

A handy person from coatesville pa. says:
we have this balance ( 34 8 40# 27" LT LOWER DS CALDWELL ) I'm trying to get a few extra to have on hand incase we need to change any out. could you provide any information on these? how do I order them, which numbers do I reference when ordering??
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Tom from SWISCO responded:
Thank you for posting, could you provide us with some photos of the balance and the window with measurements?
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