This is item #22 on the page of the users manual that explains the functions of the various switches and this should be part number 4182462 on the parts book (section F4.01).
I don't think this exists as new part somewhere as the accessory light that should go into it seems to have never been produced. I also think that this is quite risky to use it as mine burnt because it is not fuse protected. So, why would I like to get one? Just to avoid having that burnt thing under my dash while I still have easy access to it.
The part should be easy to get from any body used for parts as I guess the part being useless, it is not highly sought after. And for shipping matters, I live on the Swiss/French border so european customs and shipping costs should be better for me, but due to the low price this part should be, I think that shipping from any place in the world should also be fine.
So, if you own a coupé donor car, please have a look to check if you have that part
I' also opened to exchange as I also have some parts available on my side.