Channel balance ID

A quick learner from USA says:
I want to order 8 balancers for my windows. All the same balancer. I took the measurements as you directed, see the attached photos. From this and following along on you web site I believe the balancer I need is the 29 inch 380. My window weighs 20 lbs. I'm not sure of the specific balancer needed for this window. Can you help me? I need a top sash and it appears the Howmet is the one but it has just one screw while my window has two. Please check the photos. Can you help? I have followed your videos which were very helpful. Can you guide me and help me order the necessary balancers? Please call me. The stamped marking on the balancer is 28C
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! I agree, the S380-29 looks like a good match. For the option, I'd recommend the 2830. If you also need the top sash guide, see our 18-180. Let me know if you have any other questions?
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