Thanks Lehn for your adviseI would just settle with 8mm spacer in the rear, that's what I got.
You can take a look at this post: https://www.audi-sport.net/xf/threa...out-the-wheel-dimensions.384343/#post-3384487
Thanks all for your valid and friendly advise
Wasn't planning on putting any on the front and just go for rear spacers so 8mm is best for a flush fit !!
Assume i will need extended bolts as well?