Im replacing the headliner in my Disco 2 and noticed that the headliner looks completely different from the middle to the back, the hole for the sunroof stretches from just behind the interior cargo nets to the tailgate, and is about 2 times the size of the normal sunroof. The rear sunroof switches are also not the same as the front ones. Im stumped as I don't know how to move forward from this point. I cant replace it as the headliner sags where the massive hole is. Was this some sort of special factory option?