The front stanchions are a two-piece design. The upper portion bolts to the dash, while the lower ties into the side of the tub. Don’t weld the floor plates until the rest of the cage is built in case you need to move the stanchions up or down slightly during the cage assembly. The rear B- and C-pillar floor plates utilize the stock mounting bungs. The only drilling you need to do on the Jeep tub is for the four front floor plate mounting holes.