replace sliding glass door roller

A quick learner from Savannah, GA says:
How critical is it to know the exact measurement of the wheel? I am not sure if I need to order the, 81-030 at 1-1/4" or the 81-095 at 1-1/2" wheel. I do not have the option of measuring the wheel.
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Dave Sr. from SWISCO responded:
The problem is that with the shorter wheel you might not be able to adjust your door up high enough, and with the taller wheel you might not be able to clear the bottom track to reinstall your door. With that being said, do you know the manufacture of the patio door? If it's a vinyl door by American Craftsman from Home Depot then use the #81-095 wheel.
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