The file 'Prusa I3 X Sled Adapter 3D Printer Model' is (stl) file type, size is 33.8KB.
This is an adapter meant for the Prusa i3 rework. The notches are 24mm wide and fit an M4.
http://www.thingiverse.com/thing:119616
It is a slight modification of this thingi:
http://www.thingiverse.com/thing:84836
It should allow you to to use some of the extruders from the Prusa i2.
Prusa_i3_X_Sled_Adapter.stl | 179.9KB |