high quality shower door roller

A handy person from Scottsdale, AZ says:
I have been trying to find these high quality shower door rollers. They have nice rubber around it and ball bearings. I have found plastic replacements but they are not as good. The rubber helps for smoother glide. They are 7/8 inch in diameter. Any suggestions?
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Tom from SWISCO responded:

Hello! Based on the design of your original roller I think you could consider our 10-109 as a possible replacement. Check it out and let me know what you think!

A handy person from Scottsdale, AZ says:
Thank you for the suggestion but I have tried the hardware you suggested and it does not work as well. The door does not slide smoothly on the plastic as it did with the rubber coated roller. Also, the previous wheel was steel with ball bearings too. I'm really looking for a replacement to what I had before.
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Tom from SWISCO responded:

That is unfortunate. I am sorry to say that nothing else we sell comes all that close to your original. If you do need an exact match then you will have to try to find the name of the original manufacturer so that you can contact them directly. 

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