Well here's a list of part numbers and prices, which are fresh from a dealer near me :-
Retaining Strip (left) - 1K0 853 543 - ?4.70<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com

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Retaining Strip (right) - lK0 853 544 - ?4.70<o

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Hex bolt - WHT000188 (18 off) - ?0.28 each<o

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Skirt (left) - 1K3 853 859 9B9 - ?30.20<o

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Skirt (right) - 1K3 853 860 9B9 - ?30.20<o

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Jacking adapters - 1K0 853 493 (4 off) - ?3.24 each<o

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Fixing screws - N103 546 01 (8 off) - ?0.14 each<o

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Total Cost = ?88.92 inc. vat.
His computer wasn't live, (it was late) so he couldn't tell me about availability, but the price is pretty good. Someone's got to do a "How To" on this - I hope its not me! Looking at the bits, I reckon it means drilling holes in sills - on a new car! I don't know if I could! [:S]