You're talking about screens. Your original comment specified "parts". Things like home buttons, ribbon cables, chassis, battery, camera modules, etc, can all b

You're talking about screens. Your original comment specified "parts". Things like home buttons, ribbon cables, chassis, battery, camera modules, etc, can all be OEM. You can stomp up and down and say OEM parts don't exist, but they do. Not only that, but phones that are bricked, stolen, or maybe even water damaged slightly could have the screen salvaged assuming it wasn't ruined. They do exist. Will you be lucky to get an OEM screen, probably not, but my comment was to highlight the fact that what you're saying about parts being 3rd party 100% of the time are impossible.