Back in the late 70's, one of the magazines ran an article on installing traction bars with J-bolts. They had to length the bars so the snubber would come in contact with the spring eye. It also needed wedges to adjust the air gap between the snubber and the spring eye. In high hp situations with traction, if the snubber only contacted the spring, it would sometimes bend the spring. I like the Cal-Tracs bars better. It uses the front spring eye and the spring pad for contact points and is adjustable. My buddy's blown pro-street '67 Nova was in Car Craft on an article about Cal-Tracs bars.