Those 1967 thru 1969 A-Body 'Convertibles'
* Extra sub-frame support
* Heavy gauge sub-flooring
* Thicker seat-box frames
* Front Torque-boxes
* Rear Torque-boxes
* Sub-floor cross-brace
* Brace tabs
* Heavier lower pillar frames {A and C}
* Thicker door pillar {Center of Car}
* Galvanized rocker-panels
* Heavier gauge Firewall frame
* Welds
* Diagonal rear-seat cross brace
* Power motor for 'Convertible-Top'