Sunroof guide rail set, plastic Bus 08/67-07/79Sunroof guide rail set, plastic A sunroof on Type 2 buses is a cute option that brings a lot of driving joy. Though it is less cute when the sunroof doesn't properly work. In many cases bad functioning is due to problems with the control cables or the guide rail that obstructs a good grip of the crank cables. When the guide rail is worn out, deformed or torn, the manipulation will no longer function and you can't open or close the sunroof anymore.