Hey guys! I have been messing with my truck a lot lately and unfortunately I lost a few pieces. Can anyone identify what this is called so I can order a new one? I have tried searching everything!

PS: I just need to know what the cap is called. I provided 2 pictures.

 

Mopar part #5HF07TL2AC called a Seat Belt Height Adjuster Cover or a Seat Belt Retractor Cover depending on the vehicle model (1500, 2500+)

 

Thank you so much! I really appreciate it