So I just finished my latest mod which is my harness bar so I can mount the shoulder belts for the 4 point harness. The tube that runs across the car is 1 inch round tube stainless and the two bars that run downward are 3/4 in round stainless as well. The bars that are mounted to the B pillar are 1/4 inch stainless flat bar. I ran out of stainless bar stock for the lower brackets that mount to the floor but those are steel. Support bar have spherical ends to all the harness bar to move at least 1 inch higher or lower. Right now they have a brushed look but I am thinking of polishing it all. Let me know what you all think. I did make this at work.