bypass door item

A quick learner from Washington says:
on item 23-031...Is this unit used on front door AND back bypass door? what does it mean 1 3/8 front OR 3/4 back inscribed on the unit.....(Im just trying to replace the roller unit, but it looks like I might have to replace the entire set-up....
Thanks for your reply.
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Jasmine from SWISCO responded:

Thanks for reaching out.

So long as your original hardware is the same as the 23-031, then we are confident that it should work as a replacement. Take a look at the measurements below to confirm if this roller would be a fit for you.

Being completely transparent, we're not entirely sure what those stamped numbers mean and in our experience, they haven't influenced a repair. The best way to confirm if this part is a good replacement is to compare the physical dimensions of the roller, they are what matter most.

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