ET54 tells me that they're from an A3
they'll be perfectly fine, tho i'd see if you can find some from an A4. they'll be a bit wider fill the arches better - they're 18x8 ET43 i believe. (alternatively buy spacers for the A3 ones)
pre-empting your next question, the part number for the correct VW centre cap is 3B7 601 171 XRW
pictures please