MAW mopar didn`t invision 6-900 h.p. streetcars running around back then. I used 120 wall, 2" sq. tubing, w/ the driveshaft loop welded to them, and the 6 point cage. I didn`t want a roll bar, but from past experience knew the 505 would twist the body if it ever hooks up. I always ran w/ the back seat down in my new one back in the day, liked the way it looked !. Like a business coupe.