The faux foxfur seat pictured appears to have something like the mange going on there. I wonder is the other one better or worse....
Wheel arch extensions: A crowd with an address at
http://www.fibercar.it/codolini.html make them in fiberglass and they do ship outside Italy. They have 30mm and 60mm variants for Fulvia Coupe and also make them for the Zagato. I bought a set fairly recently (€180+€30 postage as I recall) and they're pretty rough - unlovingly handmade in moulds I'd say. I have offered them up to the car but not yet fitted them. It seems they need quite some fettling and definitely need that beading stuff along the join. Someone I know here in Ireland offered a set for sale recently - I can make enquiries if you like though he may have done some fettling on them.