Well, it's time to replace the sneakers on my 99 550. I have an incredible opportunity to get a new set Pirelli's FOR FREE! The current sizes are 255/40 ZR 18 front and 295/35 ZR 18 rear. I'm leaning toward P Zero Rosso. This is strictly a road car used in fair weather. My questions are: - Should I go with Directionale or Asymetrico? - If I can't get the original sizes, what are the correct alternative sizes? - Anyone care to recommend an alternative Pirelli model? Thanks for your input.