Dealer should replace the wheels so long as they have not been kerbed.
From what I can remember of my anni 12 months ago, the rear headrests are just plain black and you should be able to get normal gti ones from a scrappy. Aerials easy to come by as are the front gti badges.
If it has been around a while offer ?10,750 as it does have quite a few miles on it for a car of that age imho.
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