Front brakes are made by Nissin Rear brakes are made by Brembo
Honda may buy there components from the same bike manufacturers like many other makes do but it doesnt mean they are made by Honda . think u will find same will apply to triple tree.
Radiator on a Rocket is made by KTM just like most vehicles components are sourced from companys who specialize in those components. I doubt u would find many if any vehicels on the planet which are 100% made by one company.