http://www.rc-monster.com/forum/show...465#post358465
BL-revo is selling one, or you can check the rc-monster store to see if Mike has any of the XL sized ones in stock ( its a clamp & heatsink in one, but you can add a fan if needed, just screw into the fins to mount it ).
If you stick to 4s lipo and dont go crazy with the gearing, those motors should hold up for a good while, especially in a lighter buggy vs an MT.