The upper part of the knuckle.
Comparing the pics you posted earlier, and chatting to a mate, It seems that the upper part of the knuckle may have been flatter in order to add another inch or so width in avaliable tyre width on the race cars.
The different length in the crank for the TRE is just an after thought, as they were shorter on these particular knuckles.
keep in mind this is speculation, not fact.



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