81-278 with smaller wheel?

A quick learner says:
Please take a look at these pics. Appears to match best with your #81-278. The wheel is 1-1/4" while yours is 1-1/2". Any ideas?
User submitted photos of a patio door roller.
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Tom from SWISCO responded:
Thanks for posting! We have actually found a version of the 81-278 with a 1-1/4" wheel, but it is not currently available. We are adding it soon and will let you know the moment it becomes available!
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Tom from SWISCO responded:
Alright, please see our new 81-279. Compare the measurements and let us know if they differ in any way.
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