yeah, the same thing had crossed my mind. I also dont know what lurks behind the headlining but hopefully someone does cos I dont want to rip mine down. I had thought about bonding if not welding an inch or so wide strip of ally to the lips at each side of the roof on the inside, and again bonding it to a spacer block in the dead centre in order to preserve any roof profile curvature, which could then be drilled and riveted/bolted accordingly if there was no other point of fixing. It looks a great bit of kit and im just shocked nothing seems readily available for us discovery owners.
I've emailed ARB directly to find out what they have to say. I emailed oppositelock because they stocked them, but they were less than forthcoming with any information, more specificially, they didnt have the good manners to even reply
Jim