Roller and track questions

A quick learner from Oro Valley, AZ says:
I am planning to order your 81-149 tandem rollers and am considering ordering one of the track covers. I have the following questions:

1. What is the width of the wheels on the rollers

2. The track on the door does not appear worn, corroded or damaged, however it is over 30 years old. Would I be well-advised to use a new cover.

If yes, 3. Which cover is best to use, the large or small, and why?
A home owner from Oro Valley, AZ says:
I don't have photographs at this time. The track stands 1/2 inch high and is approximately 92.75" long.

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Dave Sr. from SWISCO responded:
The 81-149 can work with both of our track covers. That said, if your current track isn't broken then I see no reason why you should try to improve upon it. If it ain't broke, don't fix it, as they say.

If you want to go for it anyway, just in case, then you could just cap it off with something like our 80-102.
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