Patio door roller replacement

A home owner from USA says:
October 10, 2017
I'm inquiring about ordering parts, but do not know how to measure the rollers.
I sent photos with a ruler in the picture for scale. If you can give me an idea of what parts I need, it would be very appreciated.
Patio door roller
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Tom from SWISCO responded:
October 16, 2017
Could you use our 81-155? It looks like it's pretty much the same.
A professional from CA says:
October 16, 2017
Or the much more common 81-157.
Does it have a screw hole on top?
Tandem Roller Assembly, 1-1/4" Steel BB
Tandem Roller Assembly, 1-1/4" Steel BB
81-155
$15.97
Tandem Patio Roller, 1-1/4" Steel BB
Tandem Patio Roller, 1-1/4" Steel BB
81-157
$16.27
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