I looked at the manuals as you both recommended. They had only two standard configurations. With the AQ131/270D they had a 15 x 17 prop. With a AQ 225d/280D they had a 15 x19 prop. I have an 250A/270D. The 125 was 131 HP. The prop is, I assume, the original - white, aluminum 15X17. Will...