Spacers could be a good option as you'll need them because the D3 wheel offset are around ET45 and the D4 usually around ET35. So 10-15mm spacer that goes from 66 > 57 bore is the ideal adapter. Easily machined if there isn't an off the shelf item.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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