Herman Miller Areon chair (lead, grey) B size two dots, back & lumbar, back is from 2002 Aeron chair, this will only fit a B frame, if you do not have a B frame. This back this will not fit, the A or C frames There are no cracks or damage on the frame the(pellicle)or fabric is free of snags. Mounting screws not included , the late Bill Stumph one of two designers of this chair had his design studio in Minneapolis downtown. Bill was great guy. Also a photo of back in contrast with black fabric to show grey color better, non smoker. The bottom of back left to right is 14-1/2inches wide. Measuring from back top to bottom over 24 inches. If you have a problem.