Does anyone know if these will these fit the Lazy boy office chair sold at Costco?

The decryption provides the measurement of the recess for mounting. The spacing is such that the mount will be centered in the recess. The mounting screw holes are 4 inches apart. Hope this helps.

my armrests did not come with screws - what size are the screws?

No idea, but could you use the screws for your original arm rests? Mine came with the screws.

These are contoured so it is hard to answer your question. At the thickest point (the outside edge) they are approximately 1.5" thick. The top is concaved to accept the shape of your arm. They are firm but not hard. They are virtually identical to the original parts on my chair.

is this a universal size?

I don't know that it will fit every office chair, so I wouldn't say it's universal, but it's designed to fit the most common arm rests for office chairs.

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Ketofa Office Chair Arm Rest Replacement Fits All Styles of Arms with Mounting Hole Patterns Screws Set Desk Armrest Cover(2Pack)

Ketofa Office Chair Arm Rest Replacement Fits All Styles of Arms with Mounting Hole Patterns Screws Set Desk Armrest Cover(2Pack)

Product ID: 388314254

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Details

Brand
Ketofa
Colour
Black
Material
pu foam
Item weight
712 g
Back style
Solid Back

📏Fits 4" mounting hole patterns

🖤Durable PU foam for lasting comfort

🛠️Includes 4 screws for easy install

Description

🪑 Upgrade your workspace comfort—because your arms deserve the best!

UNIVERSAL STYLE COMPATIBILITY - Designed to fit all arm styles with 4" hole spacing—because your workspace deserves versatility.
DUAL PACK FOR BALANCED SUPPORT - Left and right arm pads included to maintain symmetry and elevate your office setup.
COMPLETE INSTALLATION KIT INCLUDED - Everything you need to refresh your armrests arrives in one sleek package.
PRECISION FIT FOR 4 MOUNTING HOLES - Seamlessly upgrade your chair with perfect compatibility—no guesswork needed.
ERGONOMIC COMFORT WITH DURABLE PU FOAM - Support your arms and elbows in style without worrying about cracks or wear.

The Ketofa Office Chair Arm Rest Replacement set includes two durable PU foam pads designed to fit all arm styles with 4" mounting hole patterns. Each pack comes with 4 screws for easy installation, providing ergonomic support and lasting comfort. Perfect for professionals seeking a quick, stylish upgrade to their office chair armrests.

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Ketofa Office Chair Arm Rest Replacement Fits All Styles of Arms with Mounting Hole Patterns Screws Set Desk Armrest Cover(2Pack)

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Brand	Ketofa
Model Number	10A0138
Color	Black
Package Dimensions	27.89 x 12.29 x 9.91 cm; 712 g
Material	pu foam
Special Features	Office Chair Arm Rest
Item Weight	712 g