I have a Buick Grand National. There is a company that sells a kit that consist of 4 bars connected in the back seat area of my car. http://img.photobucket.com/albums/v625/BrockBlackZ/braces1.jpgThese are hollow cylindrical bars ~3/4''I also so this one in which the guy made his own except out of flat bars instead of round ones http://img.photobucket.com/albums/v625/BrockBlackZ/Rearseatbraces1.jpg. I wanted to get your opinions on what you think would be better for rigidity (round hollow or flat bars)and also does this design look good? or could it be improved? Everybody that has one of these says they notice the car is much stiffer and handles better. Just one of those things that I have been thinking about during classes.