You should apply 3M(r) Weld-Thru coating P/N 05916 or equivalent, to all mating surfaces, fit the backing plate halfway into the sectioning joint, clamp and plug weld to the vehicle, position the center pillar, plug weld accordingly, install the windshield side rail, paint and repair the area, and install all related panels and components.
By BobGM Specialist
01/11/2022