These C6 Base (steel chassis) chassis reinforcement plates get welded to the front upper arm pocket, shock tower and top of frame rail. This will prevent the nuts ripping out of the chassis, and the chassis folding around where the upper arm bolts to the chassis. These are designed by CAD Chris of Parts Shop Max, and laser cut by Cage Kits.

These tabs will need some slight fitting to your specific chassis. 

Make sure you bolt the plates to the chassis before fully welding, use counter sunk hardware to locate plates to OEM upper arm nuts when welding.

*These are Formula Drift Legal