Stewart, also consider Dunlop Sport Bluresponse in the asked size. Reasonable priced, very good in the wet and the predecessor is/was 911 ceritified by Porsche. Which means this tyre can manage the mechanical forces of a rear mount engine as well. I drive them on a 1973 911 with good success. And someone here on TM has them happily on his Roadster, may be it was JohnV6 but I‘m not sure.