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Bob from SWISCO responded:
April 29, 2021
Hello there. As you gathered, these are two different types of balances. The balance stamped 16 3 BSI should have a metal channel that measures 16-7/8" in length. It is not a stock item but we can provide it for you via a custom order. I just shot you an email with a custom link to order a pair. Note these replacements will be stamped 1630, which is the same rating as 16-3. The other balance is our standard S380-17 or S385-17, with a stamp option of 1630. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the illustration below. 
Comparison of the S380 and S385 balance shoes.
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