c. Where lap belts and anti-submarine belts use the same attachment point, a minimum cross sectional area of 90 sq. mm (0.140 sq. in) of steel to be sheared if failed in tension at any point of the tab.
d. Where brackets are fastened to the chassis, two fasteners of 6mm Metric Grade 8.8 (1/4 inch SAE Grade 5) fasteners or stronger must be used.