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The Dor-o-Matic 2090 Backplate Assembly PB89 has been around since the early 1970's.  It is now called the Falcon 2090 Back Plate Sub Assembly, but it is the same thing, just different owners of the company.  This piece includes the plate casting, latch bolt, pinion gear, and retractor.

Doromatic Part # 4270902974 Right Hand
Doromatic Part # 4270902968 Left Hand

LEFT HAND BACKPLATE SHOWN

The Dor-o-Matic 1990 Housing and 1090 2090 Inactive Housing DCX has been around since the early 1970's.  Although it is now called a Falcon 1990, it is still the same device.  This housing is also the inactive housing on the Dor-O-Matic / Falcon 1090 and 2090 panic hardware.  The housing includes all of the interior springs, arm, and dogging screw.  Housing measures 7-1/2" long by 1-3/16" wide.  The center to center distance of the mounting studs is 6-1/4".

LEFT HAND SHOWN IN PICTURE

See diagrams for handing.

Doromatic part #
4270902784 - right hand dark brown
4270902782 - right hand aluminum
4270902785 -right hand black
4270902778- left hand dark brown
4270902776 - left hand aluminum
4270902779- left hand black

1990 parts breakdown

2090 parts breakdown