Hi Pete,
I had all sorts of problems getting any decent tyres for the 16 inch wheels in Australia.
Bought the following set from Tirerack in the States, and they are BRILLIANT.
7 days from order to delivery, and they're the best set of tyres I've ever had on the Cobra.
They also will make the stance slightly taller at the rear as you were wanting.
http://www.tirerack.com/tires/tires....Model=AVID+V4S
I have Yokohama Avid V4S 225/55/VR16 Front and 255/50/VR16 rear.
Regards,
Warren