you should measure at outside of the first bend, after the forged 0 ends. It looks like the real thing, and there is nothing that looks similar, other than the after market. you may find the holes in the frame pre- drilled for the factory bar. I found one for an a-body with the same attachment points on the frame.
They claim less un-sprung weight. And poly bushings, $ 300+, yipes it was $130 complete for E-body, at a mopar parts counter for replacement parts in 1976.
I love it for centering the car over the axle.+ stability under acceleration.