Cylinder length for L series

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Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference:  
Schlage has conversion kits to convert the classroom L/LV9070 to the classroom security L/LV9071 and the classroom holdback L/LV9076 to the classroom security holdback L/LV9077.  The...
All Von Duprin 370 Series trims require a 1 1/4" mortise cylinder with a straight cam.
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.
The 38-070 is not available in stainless finishes; 629 and 630.
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.