It looks like that my Prusa i3 kit came without carriage plate for extruder !@!. Can someone point right piece for me (X carriage for Jonas extruder, STL)? I have no idea if I 'm missing more parts? Spacer for extruder body? Looks like it does not need a spacer. Extruder has 30 mm space between screws to conn. to carriage. 3 LM8UU bearings on X.