A wee tip. Hunt about on Ebay or Adtrader even local scrappies for Mk3 Ghia's with the grey interior. They had the same parcel shelf if not it is damn close. Also has the speakers in it and the cable which screws in to the left hand side of the boot.
Phone them up and offer them money for the parcel shelf only. If you say you are prepared to go to £50 then i reckon 99.9% of these people will bite your fukin hand off. I mean their car is not going to be worth much more than that is it? gives them an extra £50 on top of what they'll get for the car. Could even give them your old one to put in theirs so the person buying the car won't notice the difference.
Thay can only say no
SMG