Need new channel balance

A home owner from Maple Ridge, BC says:
I am trying to find the right balance to order. See pic of old one. I think it is the S350-18 . But how do I know what stamp option to order. There is nothing noted on my old part. Hoping you ship to Maple Ridge, BC, Canada. Would appreciate your help. / Klara
Channel balance
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Paul from SWISCO responded:
I agree, the Series 350 looks close. I would double check the length of the metal channel, though. A stamp of 18E usually indicates a metal channel of 19". I would also weigh your sash on a scale to confirm the best option.
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