One problem there which the dealer should well have know... golf 5 wheels won't fit on a Polo, it's a different stud pattern (5x112 for golfs, 5x100 for Polo). Sounds like a dodgy sales ploy to me, unless the 18's had such a low offset that the rims poked out wider than the arches. As far as I know, no modern VW wheel has an offset low enough to make that happen.
Have you got a link for a site, I'm too lazy to go searching. Wonder if they'd look any good.
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