Alex,
I had a race car shop fabricate a 6 point rollbar, mig welded and built to NHRA specs. I suggest you find a shop in your area to do it as you will need proper under car frame braces to mount the rollbar to. Also they will know the size and thickness of the steel tubing for you depending on the ET/speed you want to be certified for.It costs a few bucks more for a pro to do it but then I figure my A$$ is worth it.
Perry.
