One set of four new Ate brand engine exhaust valves (made in Germany), part number 2931, 72-2931, 34074, 642231. This fits:
Opel Kadett L and Caravan 1.0L 1962 - 1965
Opel Kadett S Coupe and Caravan 1.0L 1963 - 1965
Head diameter = 27.08mm
Stem diameter = 6.95mm
Length diameter = 99.60mm