Maximum Motorsports includes a piece of PVC tubing to use as a template to mark the holes for the rear down-tubes, helping you to cut the holes in the perfect location. With the interior panels in one piece, we were forced to assemble the four rear points of the rollbar and the rear interior panels outside of the car. Installing it this way was very challenging, but the end result is super clean. We could not have done this without the help of Mark Houlahan, tech editor on our sister magazine Modified Mustangs & Fords. Thanks, Mark!