NHRA legal roll bars
It's not a Duster and it's a full cage, but here's a pic to give you and idea of the general set-up. The main hoop and rear bars will be the same on a cage or a bar. I used my buddy's shop to bend up the tubing and get it fitted real nice. You won't get that with a kit and yes, it must be cross braced. I think there was a rule change that will allow a removable cross brace now, but I'll be damned if I can find it!
P.S.
Some may notice that the side bars are not in yet. Well, that's because I'm still working inside the car and it's a lot easier to get in and out without them there, so they'll be the last part to go in before the interior.