Wich parts the top brands use?

Hello there! I’m just another rookie builder trying to figure out the mysteries of the e foil world and for me it barely means to sit on the shoulders of the giants (as the great late Carl Sagan should say). So, you guys know the brands that the top brands use on their products? I mean, most of an automobile industry uses 3rd part manufacturers like, Brembo, Pirelli, etc. I.E: what motor Fliteboard uses? Wich battery brand they use? What VESC Flite uses? And so on. Anyone have any clue?
All the best from Curitiba, Brasil. Sorry for my poor english.