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The issue is that the alternate Y endstop on the other end appears to be floating in space. It's no big deal.
The screw hole sizes for these mounts are smaller than the one for the z mount. I suspect printing using a .4mm nozzle is coarse enough that it might not make a difference. For most parts I printed using a .2 nozzle to get better strength and accuracy, and I can confirm that you'd need to drill out the holes for a M2.5 screw. I ended up using some self tapping screw eyes which look odd but really lock down the switch.