Replacement for milgard window sash balancer

A quick learner from Pinole says:
Hi, I was looking for a replacement balancer channel for milgard single hung window non tiltable. The channel without the nylon ends measures 21". The windows weighs about 12.1lb. I see there a option for 8-12 lb, 12-15 lb.I was kinda unsure which one to choose. Does that make a great difference?
Channel balance
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Tom from SWISCO responded:
Thanks for posting! A stamp of 20 3 usually corresponds to our 2030 option. I would stick with that just to be sure. If you also need the top sash guide in your first picture, see our 18-008.
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