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Do you need metal or plastic?
ETA:
It is also known as a flanged bush.
Have you had a look at the Simply Bearings website?
ETFA:
I've just looked on Simply Bearings website - they do them in steel or in bronze, as well as plastics.
I'm guessing that for your purposes the ID and the OD will be the critical dimensions (if you haven't got one, get or borrow a vernier gauge) the size of the flange less so.
Top hat bush