I get to answer my own question here... 8)
I managed to find the information on the site of Optics Planet.com.
The have for example the following measurements/dimensions listed for the SG-1 model:
]A (Nosebridge Measurement to Temple): 70mm/]
]B (Brow to Cheek Measuremnt): 40mm/]
]DBL (Nosebridge Only Measurement): 20mm/]
]ED (Nosebridge to Deepest Part of Lens Diagonal Measurement): 65mm/]
They have measurements for most of the Wiley X (and of course for many other brands they carry in their stock) models.