Mariner 75hp 1984 vs 1989

[leckbass]

I know these motors are old, but I have an 1989 75hp Mariner. Serial # C204183, model # 70754129D.

I found a 75hp 1984 in good condition I was thinking about picking up for parts. As I look more into the parts diagram, many things don't seem compatible.

Is the lower unit compatible? Oil tank? Carbs? Good idea or not?

[JOE54]

89 is compltete diff mtr , plugs might be same bout all though

[leckbass]

89 is compltete diff mtr , plugs might be same bout all though

Thank you, that's what I thought. Somebody is selling a motor on Facebook, they say it's an 84, but it looks like a late 80s which I'm looking for, but he's swears it's an 84.

[JOE54]

87 was first 3cyls, 84 is a 4cyl trim mtr inside boat 4 hoses to pump , 3cyls much better mtrs