I believe the only 19inch N rated tyres available are pirelli sottozeros. They are 295 rather than 305's at the back. I had a quote from my OPC who would have been happy to supply a set of new rims and tyres for about £2,800 (although I wonder if there is any scope for a group buy...?) and from Event mobile tyres (whom I have used before and would recommend) for £950 for just the tyres, which i thought was pretty good. They dont come up as available on the Event website but if you call them they will order them for you now for fitting in, say, November. I believe that, until this year, generally people had run 18inch rims with winter tyres due to the non-availability of 19inch n rated tyres but would be interested in confirmation of that if anyone knows for sure. All the best Andrew