I am not certain how we are going to install it when there is no faceplate on the Adams Rite MS1850S –see photos here
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but we will make it happen.
The hardware item on the door with the two black pieces of weather stripping is an applied astragal and is either the original US Aluminum astragal or is the CRL HP35711 Commercial Door Astragal with Weatherstrip as seen here:
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You can gain access to the unfinished portion of that door by removing that entire strip.
Let me know how that turns out please.