The Corbin Russwin Master Ring Reducing Bushing, part number B202-339, allows for the smaller Schlage Mortise Cylinder to be threaded into the Corbin Russwin Mortise Lock. It is threaded on the Outside to 1.5"-32-UNS-2A. thread, Inside thread is 1.15"-32-UNS-2A to accommodate Schlage Mortise Cylinders. The Standard 20-009 Master Ring Cylinder includes the Reducing Bushing.
Please refer to the Schlage Commercial Pricebook for other cylinder options.
See image below showing the Schlage Mortise Cylinder with Bushing installed:
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