Competition Engineering
(says 68-74 B-body, I assume it can fit early & later years too)
makes an 8 pt rollbar/cage kit
with minor mods/bends make it follow the roof some
I moved them a bit more towards the top of the rollbars
top curve/bends too
went straight-ish/level-ish with a slight downward angle 5* (?)
from the rollbar, for like 18"s, then bend/bent down
to go thru the package tray near the rear of it
they could be made to work
My buddy that worked for Chris Alston Chassiworks
said not a problem with rules or strength
(
IIRC I bought an extra 20' of 1-3/4" 0.120" wall pipe {overkill}
locally, to do the rear bars, custom application)
People in the back won't be comfortable or have any safe headroom
unless they are small children or midgets
but you can have a seat & seat back
(IIRC my rollbar was farther back right in-front of the wheel tubs
& was interfering with the seat bottom too,
I assume an easy mod to the seat frame/bottom of the seat...
I had one in my old silver 68 RR,
rear bars went thru the rear of the package tray
I didn't run a rear seat, but could have if I wanted
sorry no photos, car is long gone back in Sept. 2007
I'm not sure it's still the exact same part either...
click on photo has part #s