OEM Herman Miller Classic Aeron Seat Pan Part / Replacement Size A (Noted on seat bottom as “One Dot”) RARE Graphite/Black BL1 Genuine. Size in pictures: 19″ across the widest points and 18 1/2″ from back to front RARE GRAPHITE COLOR. Please review all pictures as they are part of the description and. Sure to visit our store HeyTexasBiz!