Although the fit on the original's motor cylinder was perfect, the mounting "ears" on my motor are a tad wider and didn't fit. So I enlarged the slot for the ears a bit.
The screw holes are exactly 4mm in diameter, which is fine for screwing an M4 bolt through the mount and into some backing material. In my case, however, I wanted an M4 screw to bite into the hole, so I narrowed it down to 3.9mm. I also created a copy with the holes at 2.9mm if you want to use an M3 screw, instead.
As far as the driver holder goes, my driver PCB is a tad shorter on the short axis, and a few mm longer on the long axis. I don't actually need this part, so I haven't created a replacement. Just be aware that, depending on the manufacturer, the driver mount may need to be "chopped and stretched" to fit.