I am mounting an aftermarket 3/4" rear sway bar on my 1970 Mach 1. It originally came with a sway bar but I am installing a heavier duty sway bar for better performance. I noticed my sway bar bought from NPD does not mount using the same end link bracket plate holes and the bushing bracket thread holes on the frame rails. It looks like new holes must be drilled into the frame rails and a u-bolt is inserted to hold the bushing brackets. Has anyone done this mod? Does this sound right? The insructions do state that it does not mount like originals. I called NPD and they are not sure. Please help. Thanks.