This is a new CPP brand 59-64 Chevy Impala, Bel air and Biscayne adjustable rear end panhard bar or track rod. This has polyureathane bushing already installed. When you lower the rear of these cars, the rear end assembly misaligns off-center and cause the tires to rub the quarter panels. A misaligned rear end also makes the car go down the street crooked or dog walk. This adjustable bar allows you to return the axle to the stock position. The bar is adjustable on both ends unlike most others who sell a bar that is only adjustable on one end. This is a better design because you need to adjust the rear end track with the car on the ground or on a drive on lift. SKU #26150