Have you checked a bearing house? They may have that in stock alreayd or can order it. What material? Looks like a bushing bearing. I jsut used some for the Jib I made for the station.
I need them out of steel not bronze though. The closest I have found is at ballistic fab. But I need it to set in a 1/4" steel plate, and all they have is 3/16" deep.
I can make them I have both D2 tool steel which may be overkill and cold rolled steel let me know if that's what you want and I will make them tomorrow.