Sliding door roller

A quick learner from Ca says:
Home built circa 2004, sliding patio door rollers are broken brand name says ultra but I can't find them anywhere.
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Dave Sr. from SWISCO responded:

Hello,

We can't get a good look at the top of your roller housing but it appears that there is a screw. It may be a mounting screw to secure the roller in the door.

Take a look at the 81-023 and 81-263 to see if either one of these could be used on your door. Compare the dimensions and look at the related information to confirm. Thanks for posting. 

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