8 ft sliding glass door rollers no markings

A contractor from berwick pa 18603 says:
i know the pics arent ideal but any help is appreciated I will prob need 12 of them
User submitted photos of a patio door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
This is a very unusual roller. If possible, I'd like you to give me the height of the back section of the roller housing, as well as the diameter of the roller. That might help.

Do you know who supplied the patio door? You say you need 12 rollers. Is this for a particular development or apartment complex? We have information on some apartments in the Delaware Valley, so that may give us the clue we need to find an applicable match.
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