what is the difference in the sizes ? A-C?

They correspond to the size of your chair. To find out what size your chair is, do this: rotate your chair until you are viewing the back of the chair. Place your hand on the top of the back frame that is shaped like a handle. On the back side of the piece are raised dots indicating which size chair you have. Three dots are used for size C chairs, two dots for size B and one dot for size A. If you need assistance locating the size indicator, please give Herman Miller a call at 888.798.0202.

Would this purchase just be the kit for the chair?

Yes, this kit comes with the Lumbar Support and associated hardware needed to attach to a Classic Aeron.

One hundred dollars for this piece of plastic??

This is the entire kit with control knob and rear Posturefit assembly. BACKSTORE

Does this work with the newer 2018 Remastered Aeron chair?

it's for all sizes classic Aeron chairs only , not for Remastered Aeron chair , Thanks

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Herman Miller Aeron Posturefit Stand Kit Chair, Plastic, Black, Size B (Medium)

Herman Miller Aeron Posturefit Stand Kit Chair, Plastic, Black, Size B (Medium)

Product ID: 49609280

Details

Brand
Herman Miller
Colour
Black
Item weight
590 g
Material
Stainless
Size
Size B

🦴Sacral spine support

🪑Universal Aeron compatibility

⚙️Adjustable tension knob

Description

🖤 Elevate your Aeron, elevate your day—posture perfected, pain rejected.

CUSTOMIZABLE COMFORT - Easily adjust tension with a sleek knob—fine-tune your support without hassle.
PAIN FREE PRODUCTIVITY - Maintain proper spine alignment to reduce lower back pain during long work sessions.
EFFORTLESS INSTALLATION - Install in under 10 minutes with just a Philips screwdriver—upgrade your chair, no sweat.
ERGONOMIC SACRAL SUPPORT - Targets the base of your spine for natural pelvic tilt and posture perfection.
SEAMLESS AERON INTEGRATION - Designed to fit all Aeron sizes (A, B, C) with recline limiter—like it came from the factory.

The Herman Miller Aeron Posturefit Stand Kit is a precision-engineered lumbar support accessory that enhances your Aeron chair by stabilizing the sacral area and promoting natural pelvic tilt. Compatible with all Aeron sizes featuring a recline limiter, it offers adjustable tension for personalized comfort and helps eliminate lower back pain by maintaining optimal spinal alignment. Easy to install and crafted with durable plastic and stainless steel, this kit transforms your seating experience into a health-conscious productivity boost.

Specifications

ASIN	B000LT6BFS
Age Range Description	Adult
Arm Style	Armless
Back Style	Solid Back
Brand Name	Herman Miller
Colour	Black
Customer Reviews	4.0 4.0 out of 5 stars (150)
Form Factor	Office Chair
Frame Material Type	Stainless Steel
Furniture Base Movement	Swivel
Included Components	Arm Pad
Indoor Outdoor Usage	Indoor
Is Assembly Required?	Yes
Is Customizable?	No
Is Foldable	Yes
Item Shape	Irregular
Item Weight	590 g
Leg Style	wheels
Manufacturer	Herman Miller
Manufacturer Part Number	AE905BG1
Material Type	Stainless Steel
Maximum Weight Recommendation	136.08 kg
Model Name	Aeron
Model Number	AE905BG1
Pattern	Solid
Product Care Instructions	Wipe Clean
Reclining Position Count	1
Recommended Uses For Product	Office
Room Type	Kitchen
Seat Material Type	Foam
Size	Size B
Sleeping Bag Filling Material	Foam
Special Features	Rolling
Style Name	Contemporary
Surface Recommendation	Hard Floor
Tilting	Yes
UPC	616639732047 782794007051
Unit Count	1.0 count

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