PGT aluminum single sash window

A quick learner from Bradenton fl. says:
I dont know if this is normal but the window clips are at different heights in the jams but the balancers are same length and size
Channel is 30 inches not including the end pieces
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Casey from SWISCO responded:


It looks like you have either our S351-30, with a 15-002 bottom attachment, or S390-30, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2910 spring strength option for your replacement balances. Thank you!

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