I've decided to use the 17-inch Rotas on another car, instead I'm fitting some Watanabe R-type wheels. On the back they are 15x11 -38. As you can guess from the third pic this will require some very stretched tyres, I'm waiting for some 235/60s I found on ebay. At the front I'm thinking 15x9 -13, will have to check if they fit.