This was designed for Prusa i3 MK3 and for Microsoft LifeCam HD-3000, but it may fit the Prusa MK2 too I guess.
Also, you may be able to attach any camera to it if it is secured with some zip ties.
Although it is a snap-on design I secured it to the printer with a zip tie.
UPDATE:
The ear on the top seems to interfere with the Z-calibration, so I replaced it. (The pictures are about the old one though)
The author marked this model as their own original creation. Imported from Thingiverse.