Correct Channel Balance

A quick learner from California says:
OK. Replaced one set of window channel balances with 385. Was easy to identify the shoes and tops based on your images, dimensions etc. You guys do an amazing job, thank you. Extremely happy with the function of the window after replacing the channel balances. And it was pretty easy to do. (thanks for your instructional video)

Decided to replace the Channel Balances in a few more windows and found that the parts are somewhat different. Cannot identify the parts from the additional windows but based on the dimensions and the fact that all of the windows look the same and were all builder installed I don't see any reason that the 385 Balances shouldn't work. Attached are pictures of the balances I'm trying to match (on the left of each picture) and the pics of the one I replaced with the 385 on the right. Even though they look different I'm thinking a 385 will work.

One additional question one of the window sashes that I am replacing has a 2030 stamp and the window weighs 15lbs. Would there be any advantage in going to a 2040 in the replacement part. I guess I'm asking if the window would function better with what I assume would be a stronger spring.

Thanks again. Great service fast delivery. Happy Customer.

User submitted image of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Hey, Bill! I'm happy to hear you're satisfied with our service. We should be able to help with this. I'm afraid the Series 385 will not replace the pictured balance. Yours is a unique type that we will have to custom make. It is not compatible with any standard balances. All I need to know is the length of the metal channel, the stamp printed on it, and how many you need and we can send you an order form and price quote.

As for your question concerning the option, I would recommend only sticking with the option that covers your sash weight. A stronger spring isn't always better. If the spring is too strong, the window will be more difficult to close and may even drift up.
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