modular conversion kit

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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.      
A service kit is available, part number 40-223.  Product description available HERE. 
Schlage has released a modular cylinder sales kit, part number 40-224.  It's contents and information can be found here.
There is not a conversion kit to electrify the LP373L lever control.  You need to order a complete E-LP373L-BE control through Engineering Specials.
There is no EL conversion kit for a 2390, the device will need to be replaced.
There is no conversion kit for Von Duprin Chexit device.  If delayed egress Chexit device is required, the entire device must be replaced.
Von Duprin offers two options:The CDSI/HDSI Dogging Indicator provides an at-a-glance verification of the status of the door from inside of the room. Visible “LOCKED” and “UNLOCKED” indicators show...
The Von Duprin EL option can be added to any existing 33A/35A, 98/99 series exit devices.