We haven't had much luck with aftermarket rubber or urethane control arm bushings. Just less than 30,000 miles of on- and off-road use destroyed these bushings. This caused clunking and driveline vibration. The sleeves no longer fit tight and fell right out when we removed the arms. The factory bushings (top) are light years better. Why doesn't anyone use the stock rubber bushings in aftermarket control arms? The unspoken truth is that they will generally outlast just about anything else out there.