Plastic strip thing
Ficed on to the leading edge of the rear door frames there is a piece of rubbery plastic that presumably seals the gap between the doors when they're both closed, to keep wind noise down.
One of mine is hanging off but the part that my dealer keeps supplying is different.
The "new" part seems to be designed to be an interference fit (it looks like it has to slide under something, which my car hasn't got and be held in my pressure) whereas my old one has "T" shaped holes which locate on little lugs on the rear door frame.
Dealer says the slidey one is the only part number there is, according to his computer (though a Fiat Uno doesn't exist either, according to his computer).
I just need the part number dudes. And possibly one or two of the locating lugs.
The door is the o/s passenger door, if the strip isn't upside-downable.