D5830-19 a = 6.3 L = 120
D5830-20 a = 7 L = 125
D5830-21 a = 7.1 L = 120
D5830-22 a = 7.5 L = 120
D5830-23 a = 8 L = 125
D5830-24 a = 9 L = 130