406 wheels / hubcaps

[Mike406]

help needed
I am restoring a 406 which came with 5 wheels which had little rubber buffers in the three holes
which I assumed were used to. rest the hubcap on

I was told that there are two types of cap arrangement, I got some hub caps which I was assured were for a 406 they only have two little holes in them which I assume take the round Bristol disc

having just got round to looking at fitting the caps it's clear they will not fit the wheels as there aren't ant round spigots for the cap to clip over

so the help I need is pictures and dimensions of the screw type cap fitting or details of how the clip type works

any one help

I'm not far from Warwick