406 hubcaps
406 hubcaps have a central Medallion which rotates, Undoing a screw which locates into an aluminium detail in the wheel centre.
So the hubcap is screwed down onto the rubber buffers. The earlier 2 L ones all have a pop on hubcap which just springs over three nipples.
These are threaded into the three holes you have seen with the rubber buffers in. I fitted 406 wheels to my 400 (They are 4 1/2 J, slightly wider and suit my Dunlop radials fine.)and simply threaded the three holes, had some nipples turned up on the lathe and screwed them in. Result. Sounds like you need the 406 type hubcap and the central aluminium boss which they thread into.
If you see what I mean!
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