I wonder if current repo body is smaller or less supple that the originals. I'm using 'hide from the virus' time to look through parts boxed up decades ago; this is from an NOS Lucas rubber body (PN 576105) measured as best I could:
ID of the rubber body inner ring: 2.25" OD of glass lens base: 2.335. So the rubber has to stretch about .085.
OD of the rubber body: 2.75"
I can't find a chrome ring to test-fit right now, but in the past I remember needing a small flat-blade screwdriver to seat the outer ring. In the third picture you can see there is a small ridge to help seal the lens (I think). How does it compare to the new ones you have?
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