window balance. only markings is 32 5 BR Caldwell

Thanks for posting! I am confident we can supply you with a replacement for the channel balances you need but I'll need to see just one more detail to confirm the correct replacement. 

May I see a photo of the pulley system in the center of the balance? This is where the spring and string meet in the middle of the channel.

Please let me know if you have any questions.

Thanks for the photos! Your balance resembles either the S351-33 with a 1" shoe or the S390-33 with a 1-1/8" shoe. To determine which of these is the correct replacement, be sure to confirm the dimension for the depth of your shoe.

You'll need the 3250 stamp option.

Comparison of the S351 and S390 balance shoes.