Actually... the Do-Luck bar does more than you think. The ebay knock-offs do not as they only bolt at one point on each side.
Larry A, Chris J, and I all got our Do-Luck bars back in the late 20th century - likely back when most of you were not even driving.
We paid a fair penny more than that auction was going for when I checked it.
Larry A commented that adding the bar made an 80% improvement in reducing chassis flex when driving with the roof off. WOW! I never had bad chassis flex like so many of you on here always complain about. I was riding in one MkIII with the top off when we hit some pretty nasty flex. I was floored! I had never encountered that before.
This bar is worth the $$. The ebay knock-off one is not.