OK, the case screws all appear to be 2 inches in depth, with a head with of 3/8ths (0.325 of an inch).
Woodscrews. If you want millimeters, then 50.8mm depth, head width 8mm.
They're pan head screws, the width of the screw area tapes to a point and is about 1/6th of an inch (0.164 inch) or 4.1 mm along the shaft length. It has a wood type spiral, not one for fitting a nut.
The actual tool type is Phillips, not a slot.
EDIT: 2 inch 8 gauge pan head Phillips zinc plated. If you want to be pernickity old school about it.
The ones holding the circuit board down are not wood screws, they do have a nut fitting... I can't tell if it's metric or not, seems to be 3mm across and lengh of thread about 6mm. Pan head Phillips again, Width is about 5.9mm. They're fitted with a plain washer and thread lock washer each, I'm not convinced they are all same length.
Usually Commodore fitted zinc plated screws. Not painted black. Actually the black ones or stainless will last better.