Titan case mounting hole specs

What are the rear mounting hole specs for the titan case? The M3 screws included are too small for the rear mounting holes, so I think they're M4, but I don't have any M4 screws on hand. Also, I measured the distance between the midpoints of the mounting holes as 75.5mm, and so I think they're at 75mm, but it would be great to have an engineering drawing that shows the holes, the case outline, and specifies the max screw depth without damaging the panda inside. Thank you for the information!