HE561VE tend to have an 11mm shaft common to the HX60, HX80, HX82 and HE600 turbochargers and a titanium compressor wheel. 75mm is the largest that the HE551 and 561 get to my knowledge. We can stuff an 80mm in them no problem. We can get many other sizes as well.
The 451ve units share the shaft size with an HX30, HX35, HX40, etc. Similar bearing pack. Longer shaft though. They usually have a 67mm exducer on the turbine side. The inducers are generally 66 and 67mm on the ISX15 engines but most of the industrial stuff and ISLs use a 60mm compressor wheel.