Alpha One/MC-1/R/MR Impeller Repair Kit MC-1 / R / MR / Alpha OneAlpha One/MC-1/R/MR Impeller Repair Kit Impeller Kit for Mercruiser Alpha, MR-R, #1 and Mercury Outboards replaces 47-89984Q5 47-89984T5 Color of components (housings, gaskets, ect.) may vary based on manufacturing processes. Free Tech Support by Calling 1(800) Fix-Boat or 1(800) 349-2628 Parts are made to replace factory components. Not OEM.