Sven,
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Trumpy, IIRC, you said a long while back you had some lying around?
Yes I did say that and I've more than likely still got them too.
You want them?.
Biggest task is going to be finding them, as they'll be rather well hidden these days.
There's been a few "Spring Cleaning's" since I made that statement.
For those that are interested, these are the first plugs that came out here when NZ first got Electrical supplies in the home.
As you can see from the photo, they are made from Alabaster, a form of Bakelite.