Brabham and Ferrari went one better at the 1968 Belgian Grand Prix with full width wings mounted on struts high above the driver. Lotus replied with a full width wing directly connected to the rear suspension that required a redesign of suspension wishbones and transmission shafts. Matra then produced a high mounted front wing connected to the front suspension. This last innovation was mostly used during practice as it required a lot of effort from the driver. By the end of the season most teams were using sophisticated wings. Lastly, the third innovation was the introduction of a full face helmet for drivers, with Dan Gurney becoming the first driver to wear such helmet at the 1968 German Grand Prix. He had helped to invent it with the Bell Helmets company and he had already used it at the Indy 500 race same year. Within some years it became the obvious and later even mandatory choice among F1 drivers. Despite the death of Jim Clark, Lotus won both titles in 1968 with Graham Hill, but Stewart was a serious contender, winning several Grands Prix in the Tyrrell-run Matra MS10. Stewart's winning drive during the rain and fog of the 1968 German Grand Prix at the Nürburgring, where he won by a margin of four minutes, is considered as one of the finest ever, even though his rain tires were probably better than those of the competition. The car's most innovative feature was the use of aviation-inspired structural fuel tanks. These allowed the chassis to be around 15 kg lighter, while still being stronger than its competitors. The FIA considered the technology to be unsafe and decided to ban it for 1970, insisting on rubber bag-tanks (Which meant the effective end of spaceframe chassis in F1). Safety became a major issue in Formula One. McLaren fielded a pair of Cosworth powered M7s for reigning Formula One World Champion Denny Hulme and team founder Bruce McLaren. McLaren won the non-championship Brands Hatch Race of Champions, then the Belgian Grand Prix was the scene of the team's first Championship win. In doing so, McLaren became only the third driver to win a race in a car manufactured by his own team – Jack Brabham having done it in 1966 and Dan Gurney in 1967 at Spa Francorchamps. Hulme won the Italian Grand Prix and Canadian Grand Prix later in the year. Repco produced a more powerful version of their V8 to maintain competitiveness against Ford's new Cosworth DFV, but it proved very unreliable.