Replace with 4990221-KIT
Replacement includes bottom gear, top extension and stainless steel screws.
Fuhr 3-point multipoint lock; Tongue Version

Please review all images for details.

Manual Locking Version - Lift handle to engage Tongues
Backset: 1-3/8 inches (35mm)
Deadbolt Throw 1/2 inch (14mm)
Handle to Cylinder spacing 3-5/8 inches (92mm)
Handle Height 36 inches (914mm)
Bottom Tongue position 29.65 inches (753mm)
Top Tongue position 29.25 inches ( 743mm)
Overall Length fits Doors 71.06 to 78.74 inches tall.
Note: this Multi-Point lock can be trimmed for different height doors
Used by Semco and other door companies

Fuhr Replacement Option: 4990221-KIT
This is a replacement made by HOPPE
Includes gearbox, upper and lower tongue locks and screws.
Reuse your trim, handles and keyed cylinder.

Article: How to Change the Handing on a Fuhr Lock (Change direction of slope of latch)