Google works pretty well too.
I typed in the part number for those little o-rings that go between the head and the jugs for the oil passages. You would be amazed at how many applications they have for small motors, outboards, power washers, generators, etc. You would be even more amazed on how unavailable the part is, as in special order and back order, etc. Took me two weeks to get them from our local honda small motor parts house and again two weeks from powersports online. They had to come fron Japan both times.