Identify top and bottom guides and window channel balance - 20 4 EU CMC 2

Thanks for reaching out! Your balances appear to be either the S380-21 or the S385-21 with a 2040 stamp. To determine which of these is the series you'll need, confirm the dimension for the depth of the bottom shoe. It should either be 1" or 1-3/32". Let me know if it doesn't match either measurement.

Comparison of the S378, S380 and S385 balance shoes.