Sash repairs

A quick learner from Jacksonville fl says:
Need a little help here. I think the Sash replacement part number part number is 29 inch S351-29. And I also need to replace the top sash guide j
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Paul from SWISCO responded:

We appreciate your patience with us. Take a look at both the S351-29 and S390-29 channel balances. Based on the depth of your bottom balance shoe will determine which of these balances are a match for you. You would choose the 2830 option based on your stamping of "28 3". For the top sash guide, see if your measurements are compatible with our 18-044

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