What is the difference between the 2 models?

I don’t know. But I’ve used mine for over a year in my car and it’s just perfect for lumbar support. It hold it shape. It holds its firmness.

How do you affix this to an office chair? The attachments that it comes with do not allow for the support to stay in a position.

I just sat mine where I wanted it and sat against it. It was never attached.

Does the shape of this work to keep pressure off the spine?

I wouldn't say so. You can try it and return it if not. I used this for about two months and I think it ended up making my lower back worse. I ditched it, adjusted my seat more upright, maxed out my lumbar and I'm better off without. If your pressure gets worse, seek out the most notable chiropractor you can! Good luck :)

What is the dimensions of the "B" style auto pillow?

I do not know the answer because I apparently purchased the "A" style auto pillow (much lower in height). This newer and larger version of the auto pillow looks to be more comfortable than my lower pillow. Usually the description of the item in Amazon's website gives the dimensions of its products.

Brand	TISHIJIE
Special Feature	Durable
Colour	Black
Fill Material	Memory Foam
Shape	Wedge
Age Range (Description)	Adult
Recommended Uses For Product	Car
Use for	Back
Material	Memory Foam
Item Firmness Description	Soft
Product Care Instructions	Machine Wash
Number of Pieces	1
Pattern	Solid
Material Feature	Breathable
Variety	Memory Foam,Lumbar Support
Material Type Free	Odorless
UPC	808281744442
Manufacturer	TISHIJIE
Net Quantity	1.0 count
Product Dimensions	32 x 8.99 x 24 cm; 449 g
Item model number	Lumbar Support Pillow
Manufacturer Part Number	YK-101
Size	medium
Assembly Required	No
Special Features	Durable
Country of Origin	USA
Item Weight	449 g

TISHIJIE Memory Foam Lumbar Support Pillow for Car - Mid/Lower Back Support Cushion - for Car Seat, Office Chair, Recliner Etc. (Black)

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