Up down window part

Thanks for posting. This appears to be either an S380-20 or S385-20. The only difference between these two balances. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 1940. 

Comparison of the S380 and S385 balance shoes.

We always strongly advise sticking with the original stamp wherever possible. Otherwise the windows will prove to be too difficult to either open or close, depending on if the stamp chosen is too weak or too strong. You always want to be within the correct weight range. If you sign up for auto-notification, we will let you know as soon as the S380-20 or S385-20 are again available. Many thanks.