A lot of Googling has got me precisely nowhere! I've been looking for a set of 999S cams which now apear to be unobtainable. Looking at the other Testastretta cams on Mr Blacks list it would appear that 1098 cams are similar from the specs. They are a lot easier to pick up. I haven't been able find anything on cam interchangeability between the later Teststrettas and the 999. Can anybody offer any enlightenment?