Hmmm... Not what I thought, nor what Europarts say. There are 2 sizes for the 4.2 TDI. 360mm and 385mm. I am guessing the SWB is 360mm and the LWB and Armored is 385mm.
http://www.eurocarparts.com/ecp/c/Au...1d93235&000027
http://www.eurocarparts.com/ecp/c/Au...c89aea1&000027
I'm not sure if you'd get a 17" rim over either, but I guess if you have a SWB 4.2 TDI with the 360mm fronts, you MAY just get a 17" on but I doubt it. The caliper is massive.
The sizes you mention M-A8 are probably the much smaller discs found on the 3.0 V6.