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

Herman Miller Aeron Posturefit Stand Kit Chair Plastic Black Size

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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
Back style	Solid Back
Brand	Herman Miller
Brand Name	Herman Miller
Colour	Black
Customer Reviews	4.0 out of 5 stars 149 Reviews
Frame Material Type	Stainless Steel
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
Item weight	590 g
Leg Style	wheels
Manufacturer	Herman Miller
Material	Stainless Steel
Material Type	Stainless Steel
Maximum Weight Recommendation	300 Pounds
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	No
UPC	616639732047 782794007051
Unit Count	1.0 count

Reviews

B**N

Not the same as lumbar support, a little better.

31.07.2019

M**Y

It's better than the standard lumbar with a caveat -- please read before buying.

25.07.2022

T**M

Posturefit is fantastic! But if you can, save yourself the trouble and order your Aeron with posturefit in the first place!

30.12.2011

S**N

Doesn't go high enough for me personally, maybe enough for others. I did find a hack that works.

10.01.2021

M**S

Good instructions for install. Better than the foam crosspiece support.

30.10.2018

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$21.50

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In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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