Think they are rarer than rocking horse s*** - more so 'cause I don't think anyone really knows where they are from - expect someone will be along to prove me wrong.
I have two spare ones... but they are both broken!
Not sure what they are made of, but it isn't ABS, as Dichloromethane will not weld the plastic together. I was thinking my next attempt would be araldite, and then spray the result.
My mate uses his 400SE ashtray to hide the nitrous oxide 'arm' switch...
Shame he blew the engine and it hasn't turned a wheel for over 2 years. In fact it must be longer; it was off the road when I bought my Esprit almost three years ago...