i am thinking about buying a 120 x 2 rad to hook on to my 3 x120 it will be on the back of the rad. but im not sure how to hooke the two together. i know i have seen this done. what kind of bolts do i need and does it just go . pump rad inlet1 rad out1 radinlet2 radout2 cpu block res. please correct me if im wrong or if its confusing.