I guess he's referring to the side stiffeners.

They aare mounted in a better way as well. Instead of centering on a countersunk screw, they center on a notch on the bulkheads. That way the stiffness is improved and the plates will no longer move during a crash tweaking the chassis.

I'd like a car of my own thank you!
I have to wait until all you guys have yours and see if one is left for me.....