Component Placement Volvo Bus Corporation See also, 300, Component placement, Description, Design and function The reader is advised that printed copies are uncontrolled. 48 A17.A 9813194 1 – 30 A17.B 9998533 1 – 30 A17.C 9998604 26 – 30 A21.A 9998596 1 – 17 A21.B 9990025 1 – 18 A21.C 9998596 18 – 32 A21.D — — A27.A 9990025 19 – 39 A27.B 9990025 1 – 18 A27.C 9990025 1 – 18 A27.D 9990025 19 – 39 A30 9813194 47 – 56