The Original Headrest for the Herman Miller Aeron Chair H3 for Remastered, Carb Posted on December 21, 2023 by admin EXPERIENCE THE ULTIMATE UPGRADE TO YOUR HERMAN MILLER AERON – The H4 ENgage is our full size headrest designed to provide you with the neck support the Aeron Chairs are missing. [MATCHES CLASSIC AERON CHAIR MODELS YEAR 2016 OR OLDER].