What exactly is it called? I need to know how to replace one because I recently bought a G35 that the driver side one is broke off. Anybody know the part number or name?

 

http://infiniti.sewellparts.com/part...oupe-2004.html

 

I tried looking on that infiniti parts website, but in the diagram it's hard to see which part is the actual plastic piece that is connected to the head rest on the drivers seat.

 

have a look at my post in this thread:
https://g35driver.com/forums/interio...-my-seats.html

the part numbers i have posted there are for both coupes/sedans manufactured between 8/05-8/06 with each interior color listed. if your car falls in that range, just pick the correct color to order!