I've got one of those. Used it to pull the midget all the way from Melbourne, FL to Dayton, OH. To attach it to the car, I bought a piece of 2x3 inch steel tubing, and drilled the appropriate holes to mount the tubing to the bumper mounts. Then simply attach the tow bar to the tubing.
Worked great! Can take a picture of the tubing I used if you would like.
-Tony