A door usable for after market installation of remotely actuatable locking systems is provided with a spacer element within its interior. The spacer element includes an orifice sized for accommodating a motor and locking mechanism. A tubular element is also provided through the interior of the door body adjacent to the first orifice, the tubular element being usable to accommodate wiring. A motor disposed within the first orifice can be placed in communication with a power source and/or receiver using wiring extending through the tubular element, while a lock assembly can be installed within the first orifice in operative engagement with the motor. Receipt of a remote signal by the receiver causes actuation of the motor, which then actuates the lock assembly. Use of the spacer and tubular elements enables all primary components of the remotely actuatable locking system to be installed within the interior of the door, after market.