rim cylinder vs mortise cylinder

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A 1-1/8 through 1-1/2" mortise cylinder with straight cam per Step 4 of 512NL Instructions.
See descriptions for the 09-992 thru 09-997 parts kits for modular mortise cylinders.  The 09-998 is a kit for a rim cylinder.      
The "500" Series trim in general (510L, 511L, 512's, & 513K) will work with all 25 series devices and are not device specific.
Order the device as 88 NL less trim. The cylinder will be mounted to the face of the door. Use templates 10156 and 40015.
 The tailpiece of the rim cylinder can be inserted into the Von Duprin 98/99 rim device either vertical or horizontal.