When I restored my midget, I bought some plates that were laser cut black ally overlaid on silver background. I can neither remember what they're called nor find a supplier. All I seem to find is pressed or acrylic. Anyone?
Nick
I got some a couple of years ago from Framptons, mounded numbers on a plate with a raised edge. Worth looking to see if they have a style to suit you? http://framptonsplates.com/
Wikipedia says compulsory in 73 but started in 67. I have white and yellow on my 71 Volvo and this appears to be correct and what would most likely have been fitted.
If you mean the curved ones, they were two plates back to back. Tippers do them. Used to pop rivet them back in the 60s. Would look neater glued on these days.