Changes made by Council Directive of 20 May 1975 on the approximation of the laws of the Member States relating to the steering equipment of wheeled agricultural or forestry tractors (75/321/EEC)
EU Directive 1975/321
No changes made by Council Directive of 20 May 1975 on the approximation of the laws of the Member States relating to the steering equipment of wheeled agricultural or forestry tractors (75/321/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.