Hi. I don't own prusa machines so I can't help you directly, but if you head to the prusa GitHub they have stl and scad files for their machines. Maybe you can print a similar piece if it's common between the mk1 and 2 for instance.
https://www.thingiverse.com/thing:6165555
There are other versions with no pins required. But I found the pin ones hold up better in pla.
Is this loss?