just go to towers and type hpi mounts and it willl pop up. i recommend getting the expensive one because they are way stronger. and i sorta dont get what you are asking about the clutch
http://www2.towerhobbies.com/cgi-bin...&I=LXN373&P=ML
http://www2.towerhobbies.com/cgi-bin...?&I=LXCLR3&P=7
the second one is better... you ken tell by the price lol