Okay, if you already own them and the springs I can see why you'd like to try them, don't blame you as even ladder bars and decent shocks are going to cost $1,000 here in the US.
That said, the bars themselves won't know WHAT they're on, a OEM subframe of a "back-half" deal...as long as they're installed correctly, they will do just as good of a job as they would on a non-back-half car.
