Casey from SWISCO responded:
May 3, 2018
Hello, It looks like you have either our S390 on the left, 1-1/8” thick, or S351 on the right, 1” thick, channel balance. Take a look at the image below to determine which balance you'll need. You'll also need to know the length of your balance and the weight of your sash in order to choose the correct option. Thank you! Comparison of 15-001 & 15-002
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