occupancy indicator on mortise lock

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The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
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.  Occupancy...
The Falcon MA mortise lock is available with an occupancy indicator on the following functions: MA301, MA311, MA321, MA371, MA431, MA441(inside of door only), MA451, MA541, MA57...
Related solution: Is the MA indicator available separately? 
Indicator not extended Indicator extended
The indicator on a cylindrical hotel lock is a small pin that projects outward from the face of the cylinder plug (Figure 1) when the inside push button is depressed.  When this pin is pr...