All of the sizes Pirelli has reproduced are ex-OEM. As examples, the 225/50-15 and 345/35-15 are Lamborghini Countach sizes. Even the "oddball" 285/40-15 (w/ 225/50-15 front) is an OEM Porsche 911 size (RS, RSR, GP2, etc). Wide body Pantera owners just got lucky. I'm sure the push to produce these sizes came from Lamborghini and Porsche, who Pirelli has an ongoing relationship with. These applications also fit well with the marketing of Pirelli's vintage offerings. Don't underestimate how important that is. Longstone Tyre will be lucky to get a single P7 size reproduced for us and it will make their job much easier if it's an OEM size. We had all better get on the same page if we want this to get done. I'm not disputing the 275/55-15 is a better size for the rear of most regular body Panteras but I don't believe Pirelli will make the financial commitment to produce a non-OEM size and they certainly won't make two! I believe the only size we stand a chance of getting is the size of P7 that DeTomaso fitted to 10" rear wheels; the 285/50-15.