It is from Canada and the gearcase splits. Can't seem to find a 1983 20 hp! thanks for the info!A 20 HP marketed in Canada ?----Steps for you to take.-----I assume it has the gearcase that splits.-----If so find the seal kit # for say a 1992 model 28 HP.----It lists the contents and part numbers.-----Now go to the 83 model 25 HP and compare part numbers.----Order the 28 HP kit if it all adds up.-----Sorry , but I have no idea as to what motor / parts experience you have.------evinrudeparts.ca ----can help you.