I have purchased a 1994 xjs convertable 6ltr and have noticed that it is fitted with a space saver wheel and tyre which has never been used. However on inspection i noticed the the tyre was split. It is a perelli spare wheel size 115x85R18 ihave tried to buy a new one but prelli dont make this tyre any more. Can anybody tell me if it was upgraded to a different sized tyre. or has it been superseede and if so can anyone tell me where i can obtain a perelli tyre ( space saver that will fit my car. original wheels are 16in diamond . Second question can anyone tell me the size of ordinary pirrelli tyres fitted to the car