For 1974, North American models received newly required 5 mph (8.0 km/h) impact bumpers mounted on self-restoring energy absorbers, which added approximately 25 mm (0.98 in) to the car’s overall length. On the Super Beetle, the steering knuckle, and consequently the lower attachment point of the strut, was redesigned to improve handling and stability in the event of a tire blowout. A limited-edition Big Beetle was introduced based on the 1303 LS. Available in unique metallic paint colors, the car featured styled-steel 5.5 in (140 mm) wide sport wheels wrapped in 175/70-15 Pirelli Cinturato CN36 tires, corduroy seat inserts, upgraded loop-pile carpet, wood-look instrument panel trim and a padded steering wheel with bright accents. In the North American market, a limited-edition Sun Bug was introduced as a standard Beetle or Super Beetle. Both were finished in metallic gold and featured styled-steel 4.5 in (110 mm)-wide sport wheels.