Need help finding correct 29B bsi channel balances

A home owner from GA says:
Hi! I'm a home owner trying to fix a window with a couple broken channel balances. I'm not sure which part number to order and I would very much appreciate it if you can help me with this. I believe it says 29B (there may be a C after I'm not sure it's hard to see) then BSi. The window is vinyl single hung. Not sure if this info also helps but the Window's CAR# is 157-101, the Rating is H-R30 44x60. It also says it conforms to NFRC 100/200/300 WHE-K-001. Please let me know if you need additional info. Thanks so much!
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Tom from SWISCO responded:

Hello! I think we can definitely help you with this balance. Based on the design of your bottom shoe in particular, I think our Series 775 would work well to repair your window. Look it over and let me know if you had any questions about this product.

A home owner from GA says:
Thank you. If they don't fit can they be returned? What's your return policy?
A home owner from GA says:
Tom looking at the other I see I need a 29" on the model you recommend and the shoe size is 1" what I don't know is which sash weight my window needs. How do I know if it's B, C or D? It's a single hung window.
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Tom from SWISCO responded:

We do have a return policy, which you can see here .

Your old stamp reads 29B, looking at your pictures, so you want to select our 29B stamp.

A home owner from GA says:
Ok I forgot ? thanks
How to install a S775 balance
How to install a S775 balance
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