non-tilt window channel balance

A handy person from Ca says:
28" 2740Y
Which one should I order?
Thanks.
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Bob from SWISCO responded:

See our S351-28 and S390-28. 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 hardware to see what matches best. For a new stamp option choose 2740. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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