https://www.longstonetyres.co.uk/classi ... rsche.htmlHi,give these guys a call they know a lot about tyre fitment on the older cars. Tyres are very much a personal taste, they will be able to talk you through the options,plus there are more older tyres now being remanufactured which may suit some owners of classic cars trying to keep their cars in period, on the other hand if you wanted to buy tyres which were to be used on a car used for track use or very vigorous road work you might buy the latest high spec tyre on the market? Your car with 205/60/15 is not the most common fitment, so it would certainly help to talk to them as you could easily spend well over a thousand pounds for a decent set of tyres for that car. Good luck, let us know how you get on.