EL with ALK?

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No, Von Duprin exit alarm ALK and electric latch retraction QEL or EL are installed in the same location and can't be ordered together with the same device.
Use a normally closed fire alarm as the input to the power supply option board (PS873-2 or PS914-2RS), this will hold the latch retracted.  During a fire alarm, the contact will open, dropping...
SD is Special cylinder dogging in the center case of 98/99 rim and vertical rod non fire rated devices and is available with standard, EL, QEL, CX and ALK.
The ALK uses a 1 1/4" mortise cylinder with straight cam. (NO DOGGING)