Last fall I installed a Spohn rear anti-roll bar in my 1979 Cutlass Salon because it was twisting badly off the line. I have a spool in the car but there was about 5 times the rubber on my LR fender as the RR. I chose the Spohn bar primarilly because it looked like it would work with my 3" tailpipes (it did) and it was also on sale. It also appeared to be more streetable than the rigid tube type that mounts above the rear axle. I am pleased to report that it cured the problem as evidenced in the photos below. The bar is a bolt-in unit and is a top notch product.