Channel balance part selection

A home owner from California says:
I am Trying to identify which channel balance item that I need. I have narrowed the selection down to S350,S380,S385... I believe. The part I need is 27" long. I also need 2 stop clips for removing the window. Thanks for your help. Dave
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Paul from SWISCO responded:

I have narrowed down your replacement balances to two possible options: our S380-27 and S385-27. The difference between these two pieces lie within the depth of the bottom balance shoe. The depth of the bottom shoe for the Series 380 is 1" and for the Series 385, it's 1-3/32". You will need to measure the depth of your bottom shoe, like in the diagram below to determine which of the two balances would make the best match. Whichever one chosen will go with the 2630 option.  

Alternate view of 15-004
Alternate view of 15-004
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