Caldwell channel balance 28 3 DM

A home owner from Florida says:
Hello , could you help me fund the correct one to order please? I measured the balance and it said 29 inches. Please see pictures attached.
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Bob from SWISCO responded:

See our S351-29' or S390-29. The only difference between these two balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. For a new stamp option, choose 2830. 

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