Universal Traction Bars install on a Duster....

With all respect, 318willrun, all I know is that back in the 70's and 80's, when we all learned hot rodding from magazines and going to the track, it was common knowledge that Mopars didn't use traction bars. Direct Connection bulletins said to use an adjustable pinion snubber and clamp the leaves in front of the axle.
Mopar's axles aren't mounted in the center of the spring, of course, they are closer to the front spring eye. This helps eliminate the springs tendency to wrap into an "s" shape.
The 70 Challenger R/T, with L60's and stock suspension, that I owned about 1980 would try to hook the tire going forward. In reverse, it would wheel hop like crazy, kind of proving that the suspension worked as designed.
Thousands of Mopar race cars out there, very few with slapper bars. Bill Jenkins has been credited with their design for his Chevy's. Their axles are centered on the springs, allowing them to wrap up and hop.