BMW offered its sun-loving customers a very special body version of the otherwise closed sedan in the form of the Sunroof Sedan. The middle section of the sedan roof was made of coated plastic for reasons of production. This was replaced by a design in which the rubberised roof material could be rolled up from front to back. This rolled-up roof was then fastened above the rear window using straps. That created a hybrid form made up of sedan and convertible in which passengers received a high degree of protection against draughts and yet were still able to enjoy an unrestricted view skywards.