Just got a 2002 Sailfish with 2002 225 4 Strokes. The boat came with a 15-1/2 x 17 TL prop on the port engine and a 17-M prop on the stbd engine. What do the "T" and "M" designations mean. I believe the props are different diameters. I'm not sure. I posted this on THT and got some good...