I have a 1985 Mercury inline 6 115hp engine and am trying to figure out what prop is on it.I found a number stamped on the front hub 90165F followed by a gap and another number 84142 with one number in front of the 8 that I cannot make out.Anyone have a clue what it is? I also found a number on the outside between the blades that looked like 1oo3,does that make any sense