With the lap belts and crotch strap in place, the last step was installing the shoulder harnesses. We opted for a V-type shoulder harness that uses a single attachment point for the left- and right-side shoulder straps. The angle from the driver's shoulders to the shoulder belt mounting location should not exceed 20 degrees. Angles greater than 20 degrees can cause excessive spinal compression. Mounting the straps at angles greater than 20 degrees to horizontal will put additional stress on the attachment point, and render the harness less effective at limiting driver movement. To achieve the proper angle in Project Olds, Johnson removed the rear seats and marked out an attachment point in between the rear driver-side lap belt mounts.