GENUINE OEM Herman Miller Aeron Seat Back Size C Large size 3 dots Black custom double thick mesh pellicle with letters XPR woven into the back. Condition is used but touched up to look and function like new. GENUINE OEM Herman Miller Aeron Seat Back Size B Medium Custom XPR Letters. New GENUINE OEM Herman Miller Aeron Seat Back Size C Large Black 3D01. Used Herman Miller Aeron seat pan frame size A (1 dots) OEM Genuine Aeron Parts. OEM Herman Miller Aeron Size B Back Rest & Seat Pan Frame Protectors. New Herman Miller Aeron seat pan frame size B (2 dots) OEM Genuine Aeron Titaniu. Used Herman Miller Aeron seat pan frame size B (2 dots) OEM Genuine Aeron Parts. New GENUINE OEM Herman Miller Aeron Seat Pan Size B (Medium size) Black 3D01. Herman Miller Aeron seat back Size B Smoke Grey color good condition.