Sliding door rollers

A home owner from Denver, Colorado says:
This is one of two rollers from sliding glass patio door. I removed and lubricated but did not think to measure. The door does not roll easily so I would like to replace rollers.
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Bob from SWISCO responded:

Start by looking over our 81-138. Carefully go over all the dimensions, particularly the height and width of the housing, as well as the diameter of the wheels, to see if they match. 

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