The hole sizes for the brass inserts are 5mm which is an interference fit on my Prusa i3 Mk3. I was able to tap the brass inserts into the holes with a hammer.
You can use a soldering iron to melt the inserts if required.
You can reuse the PCB screws from the Sonoff dual case to screw the Sonoff into the new mounting points.
Make sure that you strip a generous amount of the outer sheating. I stripped approx 7cm. I nicked the wire insulation while stripping the outer sheathing, so I use some green heat shrink over the inner wires just in case.
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