Since the OLED display from LDO is "thinner", you need a new cover to replace the original display. The original STL can be found at Caribou3D (by wschadow).
Since I haven't done a Caribou printer conversion (yet), I preferred the Prusa lettering. So here is a remix. I have not received the OLED yet. So I can't say anything about the quality of the design from wschadow.But I think it will fit.
Edit: I received and installed the OLED. It fits okayish. One of the four screw holes is not placed very well by the designer.
The display mounts are obviously not for the Original MK3s. It looks like they are for the caribou upgrade kit with extrusions instead of the flat plate the original has.
Update 16.08.22
I tinkered a display Mount Remix to fit to the original MK3s, you can tap the remix button, but forget about it. @Martin did a much better Job!!!!
https://www.printables.com/de/model/239786-ldo-oled-display-mount-for-prusa-i3-mk3ss-for-use-
Credit goes to wschadow as this is just a remix of his design
Here you can find the OLED:
https://caribou3d.com/de/boards-displays/67-oled-anzeige-20x4-weiss-schwarz-von-ldo.html
Additional to the cover, you will need a new Firmware.
I did a color change to highlight the letters. This is not part of the .3mf
The author remixed this model.