Window balance 21 12 BSI

A home owner from USA says:
Good Morning, I am in need of 2 window balances ( see photos) . It is a 1/2 " cannel-- 22" long--sash dimension outside is 24x50 "--weight is 32 lbs-- the channel has 2 springs inside. For the ends please see photos. Can you help? Thank you, Bert
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
This could be either our Series 390 or Series 351 channel balance, depending on the size of the shoe. Look them over and see what you think.
A quick learner from Stuart Fl. says:

Thank you for your prompt reply. My window is wood with plastic coating - so, my pick is series # 351.#2165 (30 to 34 lbs. # 15-002 and 19-002 shoe's.

Thank you, Bert

A quick learner from Stuart Fl. says:

To ALL employee's at Swisco : Thank you for a fast and efficient service. The ballast is perfect.

Good Luck to ALL.

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