I will say that the chasis listed for both the "R" and the non "R" are the same and 6mm is less than 1/8 " per side. I would buy them for my R.

 

Here's another one that I found but I would call to verify size. Hope this link works!
http://www.autopartswarehouse.com/pe...p;brandid=4391
http://replacement.autopartswarehous...sc&dp=true
P.S. Are you saying that the R has 326mm rotors because all i ever see is 300mm or 320mm.

 

Are they warped or totally worn out? I just had my brakes re-done ( pads + rotors ) and learned a lot from my dealer manager & tech (also an s-type r owner)

 

Have you tried EBC?
There's quite a few X owners dealt with them for rotors ( discs) n pads and been very satisfied.
Check them out, and if unsure, send them an email telling them exactly what you are looking for and they will check it for you.
If successful and you decide to go with them....type in scooby58 at the checkout for a 15% discount.

Jim
http://www.google.com/pagead/iclk?sa...ce%3Dgoogleebc