This web site has an extensive database of wheel specifications. Only the
Audis offer compatible options, and not all Audis have 5 bolts or proper
offset numbers.

http://www.tyresave.co.uk/contents.html

The data is located by clicking on "vehicle fitments (cars)"  or "vehicle
fitments (vans)" under the "General" catagory in the site contents list.

Information includes bolt circle, offset, and center bore.

You need 5 bolt 112 mm circle diameter, with a 35 to 40 mm positive offset
and a 57 mm center bore.

AUDI MODEL        PCD                          OFFSET    CENTER BORE

80, 90,100    4 bolt x 108                     35...42    57.0
100, 200      5 bolt x 112                     35...42    57.0
A3            5 bolt x 100                     30...40    57.0
A4, A6, A8,
V8, S2, S4,
S6            5 bolt x 112                     35 only    57.0
TT            5 bolt x 100                     28...30    57.0

As you can see, some pf the 5 bolt Audi wheels have the wrong bolt circle
diameter.

Also, you probably should verify the positive offset of whatever wheel you
end up looking at.

Mercedes uses the 5 bolt 112 mm PCD, and has reasonable offset (35 to 42),
but the center bore is 66.5 mm.

Doyt Echelberger
Ohio    USA