Where is the passenger crash sensor in a 2001 Nissan Frontier, 2 door, 4 cyl.?

What is your question?

There was an accident with my Nissan which set off the air bags. The airbags have been replaced along with the driver's side impact sensor and the centralized sensor. The passenger side air bag is in, but we cannot find the impact sensor for this air bag. Is there one? If so where is it? I want to make sure I purchase the correct one. Thanks