Replacement channel balance

A home owner from san francisco says:
Hi,
I need a replacement channel balance. Photos attached of the 'partner' side. It is 33 inches and I believe the stamp is 3250. Just not sure which series.
Thank you,
-doug
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Bob from SWISCO responded:

Hey Doug. This looks like either an S380-33 or S385-33, depending on the bottom nylon shoe depth. It's tough to tell from photos, but your balance's shoe depth does look possibly greater than 1", in which case the Series 385 would be correct; just confirm to be certain. You will need a stamp option of 3250 in either case.

A home owner from san francisco says:
Thanks for this Bob. Somehow, I seem to have uploaded the old photos with the channels from a different window.
Here are the right photos. The shoe is different on this one. Sorry for the confusion and thanks for your help.
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Bob from SWISCO responded:

No worries. This looks more like either a Series 351 or Series 390, depending on the depth of the bottom nylon shoe. The image below depicts that difference. You'll have to measure the metal channel, not including the fittings, to find the right metal channel length. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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