Falcon offers a Dummy Mortise housing, the part numbers are:
The 984D, 985D not available in 629 and 630.
Schlage offers the 38-070 is a dummy mortise cylinder available in 1 1/8", 1 1/4", 1 3/8", 1 1/2" lengths. The cylinder has an embossed faceplate to look like a standard cylinder but no keyway see here.
Not available in stainless finishes; 629 and 630.
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