the dei part number for the actuators are 524N. you can head down to any local shop or retail store that installs security systems and they should have actuators on hand.

if you are doing the install yourself, i would suggest that you are familiar with security installs and that you have a basic understanding of relays, as you will need to wire two relays together with the actuators, or use the dei doorlock relay that is provided with many of their keyless entry/security systems. *note: do not use the low current door lock wires from the brain, they do not provide enough current to work with the actuators, thus is why the relays are needed.

you will need an actuator for each door that you want to lock/unlock with remote.