Crisis3

Does anyone know if newer D3s, D4s and A7s come with a full size matching spare? I ask because most used sets I see for sale online only come with 4 wheels which makes me believe that are mostly knock offs?

mishar

D3 with 20" wheels have 18" spare. There is not enough space for the big one. Those with 18's and 19's have full sized spare.

MP4.2+6.0

D4's have inflatospares and still have crappy trunk space; almost no one sells 5 wheels in my experience buying OE sets back 10+ years now, even if they have a full size spare. Not a good indicator of whether they are OE. You need to see a part number to know it's for real, plus know the OE offsets as another oft giveaway of a replica.

jakematic

Unless Audi changed it on the 2015, which I don't see in the Order Guide, they have a similar setup to the D3 with a smaller spare.
It is not collapsible like the one on your Q that requires inflating.