35" 3440 channel balance

A quick learner from Dunkirk, Maryland says:
Can you identify my old channel balance and recommend a replacement?
Thanks ,
Larry
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Tom from SWISCO responded:

Hey, Larry. based on these photos, you have either our S351-35 or S390-35. It will ultimately depend on the depth of your bottom nylon fitting, which is the only difference between these two products.

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