Here's how I did mine On my old YJ:
Inside, I cut out the rot, put in new sheet metal, and put new plates on the bottom of the b-pillar since those had some rot too. Then I drilled holes through the new base plate and used grade 8 hardware to bold the outer plate to the inner, sandwiching the body.
The rubber isolators keep vibes down.
Did similar for the a-pillar:
(Weekend Toy) Build thread
11 Ram 2500
- H&S tuned 6.7 Cummins (DD/Tow Rig)
05 Liberty Limited
(Wife's): Minor mods, OME/JBA Suspension, 245 70/17 Duratracs