One new TRW brand engine exhaust valve, part number 3043.  The head diameter is 30.95mm and the length is 130.61mm.  This fits:

Porsche 356 1100, 1300, 1300S & 1500S 1954 - 1955

Porsche 356A 1300 & 1300S 1956 - 1959

Porsche 356A 1600 & 1600S 1955 - 1958

Porsche 356B 1600 & 1600S (616/1 & 616/2) 1959 - 1961