Tabs in the back of cover are inserted into existing notches on back the motor. Ball studs replace existing fasteners on plenum. Grommets on the bottom of the intake cover are pressed on to ball socket of stud. Grommet in blue with arrow pointing to ball stud. see attached.
After reading through 113 pages I gather that you can swap a DL8 equipped truck over to DPN tow mirrors by the plug and play method ? Most of the topic material is centered around modifying the truck to accept DQS tow mirrors.