What determines the size of my track cover?

A home owner from Olympia, Washington says:
I need to install a track cover for our patio door. What determines whether to use the large or small cover? Is it simply the amount of wear, or the height or width of the existing track?
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Dave Sr. from SWISCO responded:
Thanks for posting! This is a good question. I usually go by the height of the existing track. If your existing track is low in height and you install the taller track cover, you might not have the clearance to reinstall your patio sliding door.
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