I bought myself a Christmas present this year. I managed to find a set of barely used Schroth 4-point harnesses. They are the Rallye 4 models. They tie into the stock mounting points on the front, and use the rear lap belt anchors in the rear. They also have a buckle to detatch the shoulder harness so someone can sit in the back which is nice since they are designed to be installed with the rear lap belts still in place. These are actually DOT approved unlike many other racing harnesses out there. Since the cars will be driven regularly on the street and on the track – these seemed to make the most sense. They are also a great alternative to having a harness bar in the backseat as part of a roll cage.