I'm looking at the CC Hellbender 70. But the 41.8mm upper seat is confusing me. The measurement falls between the IS41 and IS42 on their charts. It seems to be Campy standard, and I did find one chart that indicates it should be an is42, but I'm trying to get confirmation before I order. Frame is Chinese Ti, so I can't really look up the model. eBay has plenty of 41.8 / 52mm headsets, but I really want something with decent bearings.