IS-F has 225/40/19 on the front and 255/35/19 on the rear.
I've tried all the usual suspects, blackcircle, mytyres, camskill etc
Getting a second set of alloys would be an option but the IS-F has a fairly chunky set of stoppers on it so my concern with moving to an alternative wheel size is will they clear the brakes and will a different size screw up the handling etc.