Hi guys, say i have a quick question, sorry to bother you, and i know i need to get a manual and i will soon, I started into older outboards with a FD-12, since then i have been fortunate to be able to buy a whole trailer load of them mostly jonny/rudes with a handful of others as well, get this,, for $200 , i am in heaven, many complete motors , like 15 or more and many upper and lowers too as well as a ton of new parts, like piston rings etc, the local small engine shop got out of the marine business so i got it all, right now i am focusing on getting some 18's up and going, my question to you is, are the impeller and lower unit seal kits the same on the FD-12's and the FD-15's and would i just tell FD-12 or FD-15 to the OMC guys ? i have 2 complete FD-12's and 3 FD-15's , and a rude or two 18's, and more lower units that i can count. It is like a dream come true for me as i just love this stuff, i have a couple of older ones too, sometime i will sit down and take stock of it all. But right now i would like to use the 18's , i am thinking a matched pair on each of my boats. thank you for your help