Slider door rollers

A home owner from Florida says:
The doors are 40 years old. I have not been able to find parts locally.
The measurement is about 1.5 inches wide & 2.75 inches high.
Do you have replacements?
Thank You??
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Bob from SWISCO responded:

Can you show me clearer pictures of your roller in question? From there I will do my very best to find a match for you. Thanks. 

A home owner from Florida says:
Hi Bob! I'm sorry the pics are not clearer! I can not remove them by myself for better pictures. A handyman was here and pulled them out to replace, but we were unable to find replacements at local Ace hardware/Lowe's!
Do you think you have them?
Thank YOU?? Suzanne
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