Restoring a 'Diver's Helmet-type' rear lamp

[AllAlloyCup]

Best of luck restoring this rare lamp which
Is increasingly hard to find.

I’m also restoring some lamps : Lucas AT201 tail lamps
I can find old bodies,
But finding rear brass rims to suit and also
The jewelled glass red lenses seems to be a fruitless search.

So thinking about making a mould from the one lens I have
and casting some red acrylic into it.

Has anyone tried making lenses this way or even having
glass lenses pressed? They are about 1” in diameter.

If anyone knows a source of such lenses I’d be keen to find out.

Regards

Bill G