limo bar vs. 500e bar vs. renntech bar

I bet the limo bar is the stiffest, however you cannot put this bar on a V8 w124 car.

The reason it would be the stiffest is that it is thicker than the 500E bar by .5 mm, and then it is .5mm thinner than the renntech bar, however the renntech bar has that weird bend in it, which makes it flex more.

If you understand how a sway bar works you will see that it is trying to lift or push down the other wheel so its twisting. Which one would have the least likely tenency to twist?

That is the real question...and I would say limo front bar.

Using 4 inner 500E bushings on the eibach bar will not work because the OD of the bushing from inner to outer is much different. It would not fit in the outer carrier. It is possible that something from a R129 SL would work.

Those things have the biggest front sway bar I have seen that will probably work on a w124 with some minor fabing.

The ML front sway bar is gigantic at least 35mm in diameter, I am guessing.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.