Lawson channel balance replacement

A quick learner from Jupiter FL says:

Good Afternoon,

I have some Lawson 3520 36" channel balances I need to order. Just want to make sure I order the correct ones. The top and bottom pieces do not look the same on your web site. Please let me know which ones I need to order pictures attached.

Thank you,

John 

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Casey from SWISCO responded:

Hey there, John. Have a look at both our S380-36 and S385-36 channel balance. You will need to measure the 'depth' of your bottom balance shoe to determine which of the two balances is the better match. The 'depth' measurement of the bottom shoe for the Series 380 is 1" and for the Series 385 is 1-3/32". Whichever one chosen will use a 3520 option that holds up a sash weight of 13-18 pounds. 

A quick learner from Jupiter FL says:
Thanks that answers my question.
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