The website calls them galvanized bearings, which I suspect means it's really some kind of bushing (I can't imagine galvanized balls, rollers, or races, but I could be wrong). So, if it's a bushing, just clean up the surfaces and polish them a bit. Add a touch of grease and all will be fine.
If that's not applicable, take the dimensions (inside and outside diameter, and the width) and do some online shopping for something with the same dimensions. Or call the company and ask them where they buy their bearings, and then order them directly.
Full Size Sail Rig
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