Benchmark door parts

A home owner from Delray Beach says:
1978 Benchmark Bi-fold Steel Door 36x80.25" opening
I have door,
I need,
1-top track
2-4 pins and pin hardware
3- Do I need a bottom track or just pivot bracket?
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Paul from SWISCO responded:
To start out, I recommend that you consider our 21-401 as both the top and bottom track. For the bottom adjusting pin, see our 21-002. For the rest of the pins, see our 21-044.
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