I have a similiar issue with my newly acquired Teletype. At first, it seemed impossible to screw in all 4 screws into a rack without sliding nuts, because of the position of the holes (which is a bit absurd, given the holes are made extra large in width which normally helps in such a situation). I was finally able to screw them in but under fear that the screws get damaged or bend or even the frontpanel bends.
I’m going to adjust the holes with a hand file, no big issue.
But you may want to recalibrate those holes for fixed rack inlets.
Edit: Was acquired second hand.