Changes made by Council Directive of 27 July 1976 on the approximation of the laws of the Member States relating to passenger seats for wheeled agricultural or forestry tractors (76/763/EEC)
EU Directive 1976/763
No changes made by Council Directive of 27 July 1976 on the approximation of the laws of the Member States relating to passenger seats for wheeled agricultural or forestry tractors (76/763/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.