Backset: 1-1/8 (28mm) from edge of faceplate, to center of handle
Lock case: 7-3/4 x 1-3/4
Ferco Face plate: 5/8 inch (16mm) wide, has G15371.19 stamped midway from bottom of door to lock (528 ID's the faceplate & backset)
Handle Spacing: 2-3/4 (70mm) from center of thumb turn to Center of handle.
Handle Height: 35 inches

NOTE: New Atrium/Ferco Replacement requires modification:
You will need to cut the main lock for height, as needed before attaching shootbolt extensions.
The new lock comes with a 1/4 inch (7mm) spindle ( yours is 5/16 (8mm) and a Brass Sleeve
You may need to cut the new spindle to length and cut the brass sleeve in half to retrofit your old handles.
If you need the new sleeve and spindle - install handles and remove set screw - drill into brass sleeve and into spindle, reinstall set screw - this will secure handles

1. Rods Need to be cut to length.
2. New 7mm spindle to retrofit existing handles with 8mm hole.
3. The roller cams DO NOT align with existing strikes, they must be relocated.
Roller cams from center of cam to top of spring latch: 14 inches from top 12.5 inches from bottom
Note: To remove rollers grind rivet on back side flush with bar, Install lock and then break off roller.
If the roller is removed first the parts flop around.
4. The spring latch is handed, and can be reversed.
5. NO Deadbolt, Spring Latch only Please note: This ONLY includes bottom gear

For whole replacement kit, see 4990475-KIT
Installation Note: Detailed instructions available on Website
See Article: How to Replace the Multipoint Lock in a Wooden Atrium Door