The rest of the tubing is 1 5/8x.134. It meets the requirement for diameter but exceeds for thickness. Thanks willie, that is a huge load off. I have a ton of hours into this thing and did not want to have to rip it out. I was misled. I was told I had all DOM and never thought to look. I was just cutting and grinding as fast as I could. My fault, but hostly did not think twice about it.