You know, it's entirely possible that the Discos have a very different system for triggering the airbags. The Xterra relies on deceleration, so the bumper on the front would have little effect on them no matter how they are built. The only difference is that your rate of deceleration would probably be quicker, so the airbags may fire more easily, but I'm thinking it would be a negligible amount. Anyway, perhaps the Discos have triggers up in the front of the frame rails or somewhere nearby that are triggered by the actual impact? You know, those British always have to be different!
That could explain why the bumpers are designed to deform like that.
The other idea, of course, is that the Disco frame rails do not have accordians at the front like on the Xterra. Instead, perhaps they are solid but then the bumper system has the folding mechanisms built in and that all attaches to the solid frame. The ARB then would jsut replace the crushable part that is part of the factory bumper.
Just a thought or two!
