U've got bigger balls than a squirel in season. Nah not really, all depends what nic its in, mileage what sort of driver had it etc etc. If you get it cheap as cinquecento's then give it a pop. What you got to lose? £20....
new old stock would be ok if its not been chucked about or from a flood/fire damaged warehouse,
you tried a motorfactors?
is the ebay one for just the plate or a whole kit?