You might check on Ebay for the best deals. I have found some excellent rims made to factory standards that look exactly like the OEM. As for as 19" VS 20", for an A6 you may want to stay at 18", but no higher then 19". Prices of tires and rims jump when you go from 18". If you happen to have air suspension, be sure to go to you MMI and put the car in trailer mode, as you can blow out your air suspension system if you don't. The rough ride on 20" with low profile tires would not be worth the extra cost.
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