Yes, that one's 100%.
It's a spacer in effect, whatever you want to call it - achieves the same.
Proper jigged steel, fitted outwards of the original position, which saves shear strength issues on long bolt shanks + thick spacers. Then gusseted back to the hinge area, partly to anchor it more, and also to stop them bending under sideloads.
Here's another in situ:
For the rally cars, these weren't great ('fit for scrap' after a rally was near enough the quote in the Racecar Engineering scanned article on the SeatSport site) but that's rallying. For race, they'd be fine.
Again, easy to make for a fabricator. Once the tools to jig, cut and bend steel are to hand, the rest is experience.
The Evo 2 beam was independent as various know: complex engineering job, some clever stuff going on, large centre bearings on the 2 sleeves. Expensive, and the sort of thing that is beyond the remit of hobbyist stuff.
In the last day, a whole heap of info has landed. Part number for this holy grail of
Ibiza rear beams: V 021 500 100 A.
A word with the Stealer and a GB anyone?