Panasonic PT-MZ770 Operating Instructions (Functional Manual) page 230

Chapter 7 Appendix — Precautions for attaching the Ceiling Mount Bracket
r Specification for the screw holes to fix the projector (projector bottom view)
Unit: mm (inch)
69 (2-23/32")
100 (3-15/16")
354 (13-15/16")
371 (14-19/32")
476 (18-3/4")
230 - ENGLISH