Sliding glass door rollers

A home owner from Georgia, USA says:
Hi, we are looking for replacement rollers for our sliding glass door. The current rollers have ULTRA on them, with the logo, but no other markings that I can find. The height of the housing is 1.1 inches. THe width of the top part is 6 mm. The diameter of the wheel is around 1 inch. I'm pretty sure the wheel is metal. Photos are attached. Let me know if you need any other info. Thanks!
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Tom from SWISCO responded:

Your roller looks very similar to our 81-044. I recommend reviewing our dimensions just to be 100% sure, though. 

Dimensions for 81-044
Dimensions for 81-044

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