I have a 8hp nissan not sure of year. I think late 80,s or early 90,s The prop is not thru exhaust it also uses a shear pin i have ordered 2 diff props from two diff dealers both times i got a prop with thru exhaust The numbers on the motor are NS8A and M8A-1 if any knows what year this motor is or where i can get the right prop Thanks in advance