However, although the spectators would now be able to see the players at night, they still suffered from the problem of obstructed views caused by the pillars that supported the roofs. With the 1966 FIFA World Cup fast approaching, at which the stadium would host three group matches, this prompted the United directors to completely redesign the United Road (north) stand. The old roof pillars were replaced in 1965 with modern-style cantilevering on top of the roof, allowing every spectator a completely unobstructed view, while it was also expanded to hold 20,000 spectators (10,000 seated and 10,000 standing in front) at a cost of £350,000. The architects of the new stand, Mather and Nutter (now Atherden Fuller), rearranged the organisation of the stand to have terracing at the front, a larger seated area towards the back, and the first private boxes at a British football ground. The east stand – the only remaining uncovered stand – was developed in the same style in 1973. With the first two stands converted to cantilevers, the club's owners devised a long-term plan to do the same to the other two stands and convert the stadium into a bowl-like arena. Such an undertaking would serve to increase the atmosphere within the ground by containing the crowd's noise and focusing it onto the pitch, where the players would feel the full effects of a capacity crowd. Meanwhile, the stadium hosted its third FA Cup Final, hosting 62,078 spectators for the replay of the 1970 final between Chelsea and Leeds United; Chelsea won the match 2–1. The ground also hosted the second leg of the 1968 Intercontinental Cup, which saw Estudiantes de La Plata win the cup after a 1–1 draw. The 1970s saw the dramatic rise of football hooliganism in Britain, and a knife-throwing incident in 1971 forced the club to erect the country's first perimeter fence, restricting fans from the Old Trafford pitch.