Years ago, I built a one-of-none 1967 Coronet R/T station wagon, complete with 440, 4-speed. In driving the car, I always felt the rear end of the car was kinda loose; "wagon" its tail. On junk yard trips, I found that '80's Diplomat police cars all had rear sway bars, and the rear ends were about the same width as the one in my Coronet. I stripped the sway bar setup out of one of these police Dippy's, and adapted it onto my wagon. The change in rear end stability was very noticeable.
A couple of years later, I got my 1967 R/T on the road with big rear tires on 8" police wheels that I fabricated. Although, statically, I had room for these tires in the wheelwells, when driving the car, the tire sidewalls were getting scuffed up. I decided the R/ T needed a rear sway bar as well. By this time I could not find any junkyard Dippy's from which to source the needed parts, so I ordered the Firm Feel bar. To my amazement, the rear sway bar was identical to the Dippy bar I had used on my wagon! Firm Feel had engineered the correct frame brackets, so I did not need to fab these ( Dippy rear frame rails are narrower than B-body ones ). This setup went on fairly easily. I drilled through the frame rails and attached the brackets with long bolts with double nuts. This upgrade cured my problem with the tires getting marked up. I prefer this setup to the other style that bolts to the rear axle tubes. This looks more "factory", plus it is unsprung weight, versus sprung weight of the other system.
