This may or may not work for you but it's the way I did it. First I bought some plastic pipe same diameter as my rollbar. I measured up from the mounting location to the underside of the body. Then you cut a piece of the plastic pipe to the measured length. Stick that in the mounting hole and
trace around the circumference of the pipe. Find the center of the trace and cut the hole. Make sure you put tape on the paint side. Use a fine tooth hole saw. Do the the same for the other rollbar leg. Mount that part of the rollbar then measure for the down tube and mark where it contacts the body. You may need to cut another piece of plastic to fit the inside as well. Drill a tiny hole where it meets the body. To see if this was fairly straight I tied a string to the down tube mount and up through the holemto where it mounts to the back of the rollbar. If this looks good to you then cut the hole. Generally this hole will need to be filed oblong as the upright bar passes though at an angle. I filed mine with a die grinder.
This might seem to be a lot of trouble but it worked for me.
Hersh
