The black steering wheels fitted as OE to later Aurelias and early Flaminias seem to often crack with age, particularly the centre horn push assembly with its chrome fitting as per the attached photo. Also the chrome horn rings can deteriorate and come apart.
Not sure quite how but I have a couple of surplus centre assemblies and horn rings with good chrome and minimal imperfection of the black plastic. A photo is attached.
I don't have any spare good 'Aurelia' centre buttons that I can see.
If interested please email me.
Chris