1. a cover for the drivers side windscreen wiper locking nut.
Not sure, but might still be available through FIAT dealer - part number 82444928
2. to one side of the rear widow there is a small rectangular hole that had a push in blanking. This seems to have been lost at some time.
Is it that someone removed and blanked off the rear wiper? - not sure if there was a recognised FIAT part to cover this if it is. Here is a link to a thread relating to the rear wiper removal.
remove rear wiper HTH
Bob