Yeah the oil inlet and outlet are two different sizes. If you can find the hose that will split the different in width between the two, go with that and fasten the loose end down with a zip tie or otherwise.
Just take the head off and while you are at it - the cylinder off the piston. I used to fret about taking the cylinder off after just putting it on but now I just yank the damn thing off and get after it. Then take a picture of your piston and the inside of your cylinder.