The other aftermarket bumpers for the FJ fit as close or closer to the body including the ARB so they must not be worried about flex. The FJ does have an extremely rigid fully boxed Prado frame and these are heavy steel bumpers so that might account for it.
ARB
Bent-up Fab
That is a real picture of the All-pro bumper the photoshop was just to show it in black, here is the original.
Bent-up Fab sliders
