Went to Lexus who had a look and they confirmed the pads were exactly the same dimension as the OEM. They said that my current discs were concave (so difficult to see!) and hence only the centre part of the pads were making contact. With a few hundred miles of bedding in the new pads should mould to the discs and problem solved! :) Btw, great pads, definitely less dust and good grip, even with 3/4 contact! :D