28 inch channel balance

A quick learner from Compton says:
Hello

Please let me know which channel balances I need

Thanks
User submitted photos of a window balance.
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Tom from SWISCO responded:
Carefully compare your balance to our S350-28 with a 2740 option.Could this be the balance you have been looking for?
A quick learner from Compton says:
Hi Again

In particular what differences are critical? I looked at a variety of balanaces on your website and a lot of the plastic tops and bottoms of the balances look the same
Do I measure the window shoe?

Or can I mail you one of these balances to match up?

Thanks
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Tom from SWISCO responded:
Yes, the size and style of the nylon caps are probably the most important thing to consider. The Series 350 comes with a 19-002 top and 15-004 bottom, so as long as those are the same you should be okay.
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