Evinrude/Johnson outboard upper drive shaft

Power head / lower unit upper drive shafts

20 and 25 inch standard transoms
shaft lengths 24-3/4, 25-1/4, 25-11/16, 29-3/4, 30-1/4 and 30-11/16 inches 

20 " Standard transom
P/N 22431
OMC 5000618
length 25-1/4 inch
V4 years 1978 to 1991
V6 years 1976 to 1991