Hi folks, I'm looking at getting a set of winter wheels and tyres for my A3 and have seen some on ebay from an A6. Will they fit ok? I've had a look at fitment guides and think A3 are 5x112, 45-50 offset, 57.1 bore. The A6 looks to be the same apart from the offset is 35-45. Problem is, I've no idea what an offset is! Thanks in advance!