2210 is stamped in to aluminum rail. Balance assemblies are 23 inches long with a 1/2 inch width. My concern is getting the correct plastic/nylon ends.
Bob from SWISCO responded:
March 4, 2021
See our S351-23 or S390-23. 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 2210.