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It´s a good guess, as the nut and the way it is manufactured is about the same as those.
But i can´t find any place for it.
I never took the horns and airpump away from the impact beam, i took it away whole.
I haven´t loosened any brakelines, but i´ll check it.
Need all tip you all got.
As a hint to maybe where it was located is that before i cleaned it it was black from either dirt or alternator belt 'dust' and a little bit oily.
At front, at the airpump and horns, everything is bone dry.
And on other side around the secondary oilcooler, everything is also dry.
I am thinking somewhere around the alternator, or at rear of engine on gearbox somewhere, as when i hydrolocked it i spilled some oil on right side of engine when i took the valvecover off.