The Konig Premium Self-Tensioning Snow Tire Chains # th02230k45 are confirmed to fit your 2006 Jaguar XJ Series with 235/50r18 tires and I do not see any issues with this setup. The only thing I would say is that it takes some time to install these chains, so if you don't plan on keeping them installed for a long time then I would go with a different set of chains.
I personally would go with the pewag Servo RS Self-Tensioning Tire Chains - 1 Pair # PWRS77 instead. This offers a much simpler... view full answer...
It looks like you have typed 2008 Jaguar Kj. There is a Jaguar XJ and a Jaguar XK but no KJ. For the XJ or XK there isn't a custom fit cargo mat available so you would need to use a universal one such as # WT11AVMCB.
This mat can be trimmed front to back from 36 inches down to 27-1/2 inches. And then from side to side from 53 to 41 inches. view full answer...