Sash balance

A home owner from Montclair, CA says:

I have more photos but can upload . Windows are Imperial Window. Two sizes

Name: Minh

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Tom from SWISCO responded:

Hello, Minh. Your balance appears to be a match for our Series 770 . Look it over and let me know if you agree.

A home owner from Montclair, CA says:
How do I know what length? If 17c means I should order 17"?
A home owner from Montclair, CA says:
These parts also needed to be replace. Can you tell what parts are they and their part numbers so I can order them as well. Thanks
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Tom from SWISCO responded:

I recommend just measuring your balance. That's the best way to know what length you need without having to guess. 

As for these other parts, I will assemble a list for you in the same order as your photos. Please note that these parts are not guaranteed, they are just my best guesses based on the visual appearance of each one. You need to measure your parts and refer to the dimensions we show for our products in order to confirm that they're correct. Don't just take my word for it; double check each one.

I have to stress that you need to measure each part to match them up with the dimensions we show on each product's respective store page. In most cases, this will require you to remove the part from the window in order to do so. I highly recommend that you do this before you place any order. The parts that I've recommended are only my best guess based on visual design. If the sizes of my suggestions differ in any way, please tell me exactly how.

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