Just in case you stateside low budget scroungers need some really stout thick wall tubing, (HSS or better, maybe 1 1/8 OD). Check out your "junk" yards for Saturn
coupes. The side impact bars are easy to remove.....a hammer (brick) to shatter the polymer outer door panels and a cordless sawz/all to cut thru the attaching
sheet metal. This stuff is way too good to send to China and have it come back as... anything/everything