Motherboard Dimension Help Needed

As a project for my BTEC Level 3 Mechanical Engineering qualification I will be building a test bench that can house mini-ITX, micro-ATX and ATX motherboards. So far I have struggled finding any images that show the dimensions for the screw locations for all of the motherboards.
My request is that someone in this community can recommend sites to look at or even link me to the images.
Thank you in advance.

tl;dr I need images of motherboard dimensions (ATX, mATX & mITX)

Simple Google search for at screw holes


It's the same for mATX and ITX...

I'll link the PDFs for the official specs.

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They either took the information down, or it is not available for public view anymore. Do you have the pdf´s or a link to sites where the info is still up?