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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Description

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

DUAL SIDED DESIGN - Left and right arm pads tailored for perfect ergonomic support on both sides.
SLEEK BLACK FINISH - Modern, minimalist black color that complements any professional office setup.
PREMIUM PU CUSHIONING - Experience all-day comfort with high-quality polyurethane pads that resist cracking and wear.
COMPLETE INSTALLATION KIT - Comes with 4 screws ensuring a hassle-free, sturdy attachment to your office chair.
UNIVERSAL FIT FOR 4 MOUNTING HOLES - Seamlessly upgrade your chair with precision-fit armrests designed for standard 4-inch hole spacing.

Ketofa’s Office Chair Arm Rest Replacement set includes two durable PU arm pads with a sleek black finish, designed specifically for chairs with 4-inch mounting hole patterns. Each set comes with 4 screws for secure installation, providing ergonomic support and lasting comfort for professional office environments.

Specifications

Brand	Ketofa
Color	Black
Special Feature	Office Chair Arm Rest
Product Care Instructions	Wipe Clean
Unit Count	2.0 Count
Recommended Uses For Product	Office
Maximum Weight Recommendation	250 Pounds
Pattern	Solid
Room Type	Office
Age Range (Description)	Adult
Included Components	Screw
Arm Style	With arms
Surface Recommendation	Hard Floor
Furniture base movement	Glide
Indoor/Outdoor Usage	Indoor
Fill Material	Polyurethane
Reclining Position Count	1
Tilting	No
Is Customizable	No
Is Foldable	No
UPC	727523250520
Form Factor	Double Pointed
Item Weight	1.57 pounds
Package Dimensions	10.98 x 4.84 x 3.9 inches
Item model number	10A0138
Is Discontinued By Manufacturer	No

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