It's easy to see if you have long enough bars to do it. if you loosen the bolts can you slide the bar forward enough to reach the front spring eye with your rubber snubber?
Also, you can temporarily remove the snubber, unbolt the rear clamp and raise the front of the bar to about 3/4" away from the bottom of the spring eye.
If it works out that you can do these rough measurements, then cut the rear mount and clamp in a piece of filler metal with vice grips and re-weld it. Cut your rubber bumper down to size and reassemble it.
Do a test with them off and on the car and let us know how they work for you when properly adjusted. There are still folks on here who tried them years ago with the bumper even farther away from the spring eye to the point they never touched the front of the spring, who say they don't work on Mopars. They won't if you leave them like that.
