Door rollers

A professional from USA says:
I need 6 of these wheels
MASSIV construction
User submitted a photo of a patio door roller.
1980 U.S. Pat. 4,194,288
1982 Can. Pat. 1,126,579
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting! Check out SWISCO product code 81-018, Sliding Patio Door Roller. Compare the measurements to see if this could work as a replacement.
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