For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningSpeaker Replacement Reference
Speaker Replacement Reference
Component
Repair Instruction
Front Door Speaker
Radio Front Side Door Speaker Replacement
Front Tweeter Speaker
Radio Windshield Side Garnish Molding Speaker
...
SIR Identification Views
The SIR Identification Views shown below illustrate the approximate location
of all SIR components available for the vehicle. This will assist in determining
the appropriate SIR Disabling and Enabling for a given service procedure, refer
to SIR Disabling and Enabling.
Supplemental Inf ...
Explanation of scheduled maintenance items
Basic information
The following section provides a detailed overview to help you better understand
the scheduled maintenance requirements for your Nissan Armada. These descriptions
explain why each service item is important and how it contributes to the long-term
reliability, safety, and perf ...