window channel balance

A handy person from Canada says:
window channel balance: (06/05) UNIQUE 13-C-30
14 inch long metal channel.
I emailed earlier and got some info but I cannot decide which style it is, S390 or S351
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
It's tough to say. It depends on the depth (heel-to-toe measurement) of your bottom shoe. The difference is subtle, so it's hard to eyeball, but yours might be the 15-001, which is 1-1/8" deep. If it is, then our Series 390 would be the better choice.
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