Both the plastic cases for our XM 'plips' are disintegrating, that is
the rubber cover over the two buttons is falling apart.  Does anyone
have any ideas where one might be able to get replacements?  They are
not a Citroen spare as far as we can tell.

Also does anyone know what this would be called in French, my French
is reasonable and I may well ask in some French language groups but
I'm not sure what to call it in French (it doesn't really have a
proper name in English!).