For Sale Brand New Authentic Herman Miller Aeron Chair PostureFit Butterfly Pad Black. Brand new items in open box. (this is Authentic Herman Miller parts, not third party or aftermarket fake). These parts for Classic Herman Miller Aeron Chair. Works on any classic Aeron chair size A B C black (1996 – 2017). Not for latest version Remastered Aeron chairs 2016. This sale for 1 Genuine Herman Miller Butterfly pad only.