How do I determine the correct channel balance weight?

A quick learner from Mesa, AZ says:
I have this as 395 channel balance and found the correct ends but not sure of the correct weight, can you look at the attached pictures and tell me if 4 is correct that is stamped on it?
Also can you identify the correct window lock part for me to order?
User submitted photo of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Based on your pictures, I would start with our S380-28 channel balance and 90-005 window lock. Just make sure all the dimensions we show for each part are the same as yours.
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