Add Rear Stress Bar

Added a rear stress bar from ECS Tuning to the trunk in order to reduce body flex and add rigidity.

I could not get the brackets to fit around the seat catches until I went to the hardware store and got some bolts that were a few mm longer than the ones which came with the kit.

Now that the brackets seem to be solid, I'm hoping the occasional need to remove and replace the stress bar if I need full cargo capacity will only be a matter of slacking the tension and removing the bolts which hold the bar to the brackets.