Herman Miller Classic Aeron Replacement Seat Pan – Size B / 2-Dot. Brand-new aftermarket replacement seat pan with a preinstalled foam insert for the Herman Miller Classic Aeron chair. This replacement is ideal for repairing a cracked seat frame or restoring a worn chair. It is made from durable materials and designed for a proper fit on compatible Size B Classic Aeron chairs. Fits Size B Classic Aeron chairs, which are the medium-size model identified by two raised dots beneath the top lip of the backrest. Please confirm your chair size before ordering. Brand-new aftermarket replacement part. Durable plastic seat pan frame. Foam insert already installed. Rated for users weighing up to 350 lbs. Designed as a direct replacement for the original seat pan. One Size B plastic seat pan frame. One preinstalled foam insert. Mesh upholstery and mounting hardware are not included.