The lock I want to replace is 91/2 long by 7/8 wide with a 1 3/4 off set. Will this one work as a replacement?

That matches very closely with the measurements of this, but you can only replace with this if your original is an Atrium. It would have these same handles and the same rounded lock faceplate. Does yours have those?

Do I need to buy replacement lock & key separately ??

no, if you purchase the insert lock it comes with lock and key. The unit will fit perfectly into door with no adjustments. the new plates should be also used when installing the assembly. you will be very pleased with the unit.

Would this product work for a Ferco 528?

I have no idea, not surewhat a Ferco 528 is.

What are the exact measurements to this lockset? Have 45 year old doors that looks to be same lockset need measurements.

Backset is 1-3/4"; Lock faceplate: 15/16 by 9-5/8 inches; handle plate: 1-3/16 x 8-1/4 Flat, 3 screw holes; Distance from the center of handles to center of Cylinder 3-5/8 inches (92mm).

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Description

🔒 Upgrade your Atrium door with style and security—because your entrance deserves the best.

UNIVERSAL HANDING DESIGN - Fits both left and right-handed doors effortlessly—flexibility meets convenience.
COMPLETE INSTALLATION KIT - Includes screws, strike plate, lock, and handles for a smooth, all-in-one upgrade experience.
PREMIUM POLISHED BRASS FINISH - Elevate your door’s aesthetic with a sleek, modern brass look that stands out.
SEAMLESS ATRIUM COMPATIBILITY - Perfect exact replacement for original Atrium door locks—no guesswork, no hassle.
REKEYABLE SCHLAGE CYLINDER SECURITY - Customize your security with a trusted Schlage SC-1 keyway, including 2 keys for peace of mind.

This polished brass Atrium door lock replacement offers an exact fit for original Atrium doors, featuring a rekeyable Schlage SC-1 cylinder with two keys, universal handing for left or right doors, and a complete installation kit including screws and strike plate. Designed for 1-3/4 inch thick doors with a narrow 1-3/4 inch backset, it combines premium materials and trusted security for a seamless upgrade.

Specifications

Brand	Countryside
Special Feature	Key Lock
Lock Type	Key Lock
Item dimensions L x W x H	16 x 3 x 14 inches
Material	Brass
Recommended Uses For Product	Atrium Doors
Style	Modern
Color	Brass
Number of Pieces	1
Finish Type	Polished
Included Components	Atrium Door Lock
Controller Type	Hand Control
Shape	Square
Control Method	App
UPC	697691750798
Manufacturer	Kelllelldaaa-Countryside
Part Number	ML800
Item Weight	3.59 pounds
Product Dimensions	16 x 3 x 14 inches
Item model number	697691750798
Is Discontinued By Manufacturer	No
Finish	Polished
Item Package Quantity	1
Special Features	Key Lock
Batteries Included?	No
Batteries Required?	No

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