Identification assistance

Thanks for posting. This looks like either an S380-21 or S385-21. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. For a new stamp option choose 2020.

Comparison of the S378, S380 and S385 balance shoes.