
I used some old non-digital calipers to measure them & got 4mm x 8mm for the short screws, 4mm x 10mm for the others.
The short screws are used to hold the smaller E-Tuner & Wah plates in place. The longer ones are for the main plate & you'll need 4 of them.
I didn't take out the screws for the main switches as there are nuts holding them in place & the wiring is very delicate in places. The heads are 5mm wide &, like the longer screws, they're countersunk.
These are the screws for the tuners which you probably already have...

I'd imagine the smallest screws will be the hardest to find due to the slightly unusual head shape. Still, as you seem to be missing the little mounting plates too, it probably isn't a big deal.

Another detail I've found is that some Wah panels have the same "ON" inscription as the E-Tuner. Mine doesn't. I have no idea if this is a later change in the design or a mistake when putting this particular guitar together.
Finally, this is the original switch...

Probably much easier to source as these look pretty generic to me.
