Just got them in. The axles measure exactly 8.25" wide. I'm setting them up with a Real 8.25x32 and they are completely flush with the edge of the board (at mounting point). The aluminum part of the hanger also surprisingly measures true to size at 144mm.
I wonder how Ermico lines up the mounting holes? Some are clearly closer the edge of the baseplate than the other. Upon further inspection, the baseplates are way out of square. Additionally, Stage XIs look shinier than older stages, but there are deep casting marks compared to a Stage VIII (which have a course finish, but all previously sharp corners are rounded off and casting marks are smoothed out). I know trucks are meant for abuse, but I felt that Indys were once semi-precision components. And if the baseplates are trapezoidal, that does not make feel confident with hole alignment.