DRIVE in deadbolt for falcon

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The 9550 series Senior Swing WILL NOT work on a pair of doors with auto flush bolts. The 9560 series Senior Swing and a sequence module are required when used on an pair of door with auto flush b...
The standard latch projection is 1/2".  Falcon also offers a 3/4" throw with a 2-3/4" backset.
The replacement for the D871 is the D271.  None of the parts are backwards compatible. D271 description:Thumbturn x Occupancy Indicator Deadbolt thrown or retracted by turn unit only. ...
The Falcon D400 and D800 series (including the D871) were discontinued in 2008.
Both the Schlage B571 and Falcon D271 are occupancy indicator deadbolts that read "IN USE" and "VACANT".  The B571 is shown below but the indicator will be identical to the D271 (see Figu...