Hub bearing spacer/connector.
Sorry, been sidetracked by two broken springs, wishbone bush, stuck bonnet (see warning elsewhere) etc., etc.
Yes, all the hubs I have looked at have got these plastic rings, as shown in Brian's very clear photo.
Still don't know what they are for. A very gentle pull will separate them, so I assume they are meant to gently clip the two races together until the bearing is pulled tight (perhaps in transit or storage).
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