These drawings illustrate the dimensions of the FARO surface mount plate and interface ring for the Fusion, Quantum, Platinum, Titanium, and Gage FaroArms. You can find these drawings and details in the latest FaroArm and Laser ScanArm User Manual.
Figure 1: Part Number 2695--Surface Mount Plate
Figure 2: Part Number 1149--Interface Ring
mounting, mounting plate, plate, surface plate, base plate, black mount, 3.5" ring