Need to replace threshold

A quick learner from Montrose, Ga. says:
I'm in the process of remodeling. I'm having carpet taking up and putting flooring down. The threshold in one bedroom needs to be replaced and not sure if should also replace the wheels at the bottom of the mirrors. The threshold is about 71 1/4 inches long and 4 inches deep. I would like to know if you can provide me with the parts needed, how much, and long it will take to get them.
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Tom from SWISCO responded:

Looks like you need a new closet door track. Our 23-242 is a slightly different style, but it should work the same way. As for the roller, you can keep using yours if it's still working, but I can make a recommendation just in case. See our 32-041.

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Sliding closet mirror door rollers and tracks
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 Sliding Closet Mirror Door Rollers & Tracks
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