Hello,
You will need the following parts to install a PacBrake system on your truck:
The C40106B is just the brake itself. If you do not currently have a brake that you are replacing, you will need a mounting group and control group. Assuming you have on-board air, the part #'s that you will need in addition to the C40106B are C11558 and C10319.
https://www.ultrarvproducts.com/C11558-Mounting-Group-for-C40106
https://www.ultrarvproducts.com/C10319-Control-Group-CAT-3116E-3126-3126B