Difference between S351 and S390 1/2" Wide Channel Balances

A handy person from Clearwater, Fl says:
My 1/2" Wide Channel Balances look like both of the ones in your pictures.
(S351 and S390) What is the difference?
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Tom from SWISCO responded:
The difference between these balances is found in the size of the bottom shoe. You will need to measure your shoe to confirm which is the better match.
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