316368 called a SPRING used from 1960 to 1970 on the 40 HP.---And on the 20 / 25 / 35 / 35 HP up to 2005 models.-----.-------Lots of those around.---Dealer might even have it in stock.----Most old time shops would have a few laying around.-----They are proud of that item.----Only on sale at $38...