i honestly dont know mate.

their tsw of some kind ,there is a pic of them in the photoshop section under--CAN SOMEONE PUT 18S ON MY SAPH.

dam good point though mate ...how would i measure the offset?
my man phoned yesterday to inform me that he cant find any obvious problem i am seriously thinking about selling the car now as i no longer enjoy driving her its doing my f**king head in.

thanks for the help though guys, i will check all the above before i throw the towel in