Good luck with your choice!
I ran them on a '72 Challenger and they did start to break the spot welds on the crossmember. And this was NOT used to jack up the rear of the car. I was using them to pre-load the passenger side to improve drag strip launches. My suggestion is to fully weld your shock crossmember. And examine the welds once in a while. its much easier to repair the crossmember if you catch it before its completely torn loose.
