Please note the size of this seat. T his is a size SMALL size A also labelled ONE DOT on the seat bottom also on your seat and seat back. OEM Herman Miller Classic Aeron Seat Pan Part / Replacement Size A (Noted on seat bottom as “One Dot”) This is a RARE Graphite not Black BL1 Genuine Herman Miller part. Size in pictures: 19″ across the widest points and 18 1/2″ from back to front. This is a Size SMALL (one dot) replacement seat. Please be sure to check your chair for correct size. Please review all pictures as they are part of the description and. Sure to visit our store HeyTexasBiz!