Window Balancer Replacements

A home owner from Portland Oregon says:
Need to replace these window balancers from my 1988 Milgard windows.

Part # shown is 2640G
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Casey from SWISCO responded:

Depending on the depth measurement of your bottom balance, will determine whether our S380-27 or S385-27 will work in place of your existing balance. Whichever one chosen will go with the 2640 option. 

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