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1 • Steering wheel and control head - non adjustable
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2 • Steering wheel and control head - adjustable
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3 • Steering box - BN1, BN2 to 231108
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4 • Steering box - BN2 from 231109, BN4 to 68959, BN6 to 1994
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5 • Steering box - BN4 from 68960, BN6 from 1995, all BN7, BT7, BJ7 and BJ8
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6 • Steering rods and idler - BN1, BN2 to 231108
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7 • Steering rods and idler - BN2 from 231109, all BN4, BN6, BN7, BT7, BJ7 and BJ8