That's a nice roller.
Rotary carb is much easier to set up with that servo.
Engine mount
http://www3.towerhobbies.com/cgi-bin...?&I=LXBMF0&P=Z
Also, here all are the parts for the GT2 which most might fit it.
http://www3.towerhobbies.com/cgi-bin...I=ASCC7092&P=Z