The PPE 158000111 7/8" Drilled Stock Center Link is a stock replacement that is pre-drilled so you can install the PPE Race Pitman Arm & Race Idler Arm on your 2011-2016 GM 2500HD/3500HD. Upgrading your stock pitman arm and idler arm is a crucial step in strengthening your steering. PPE's Race Pitman Arm and Race Idler Arm both use a larger 7/8" bolt which is why you will need the 7/8" drilled stock center link.