Hi, on the journey home from picking up my 3dr 16v (Devon to Edinburgh) - I hit a massive puddle which made the most horrendous noise and as I looked into the rear view mirror I saw a peice of plastic fly off into the bush

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It turns out I've ripped off the LH side skirt but the arch trims are still intact. Where is the best place to purchase a replacement part? Will I get a VAG one or will it be a pattern part or do I have to find a breakers? I'd prefer a new item if possible.
Cheers
