I need 2 Replacement Channel Balances

Thanks for posting. This looks like either an S380-28 or S385-28. 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 balance to see what matches best. See the diagram below for reference. In either case, for a new stamp option choose 2750.

Comparison of the S378, S380 and S385 balance shoes.