Hi Vm,
For me if I made some it would be easy just to machine some up in a lathe out of plastic or just get a sheet of alloy and G clamp
a small bit to a round socket the right size and hammer the edge over the socket then trim it to size and drill the centre out to make
the larger black washers. Not sure how long postage will take but some washers are in transit.
Cheers
Max
