Roller replacement

A quick learner from Brussels, Belgium says:
I would like to know if it is possible to have parts like the model enclosed. Measures are in millimeters.
I would like to buy 500 to 1000 parts. If it is ok would it be possible to have an exemplar before the order to test the product
User submitted photos of a patio door roller.
Profile picture of Tom
Tom from SWISCO responded:
I think you should look at our 81-148. This looks really similar to me, but compare the dimensions and see if you agree. I'm afraid we are not able to send out samples of roller hardware.
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