replacement parts old bi-fold doors

A quick learner from Long Beach, NY says:
I have 96" tall old bi-fold doors that I need replacement parts for. the thickness of the door is 3/4" . Please note the building has settled quit a bit and there is a big gap between the door and the top track any suggestions besides cutting new doors
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Paul from SWISCO responded:

Before cutting new doors, we have some possible replacements that might work for you. Try shimming the 21-128 bottom plunger plate up. You should also take a look at our 21-130 or 21-129.

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