OMC Stringer 1966-1977 Propeller Prop Nut Nose Cone Plastic 0373798 0310595 Kit Flywheel but you could always just

but you could always just swap out yours

This works on the very early 470 engines ONLY (S/N 5195053 & below)

Handle: 277888

Item Details MerCruiser Sliding Propeller Prop Shaft Clutch dog 52-66063 used in all MC-1/R/MR/Pre-Alpha Gen 1 Alpha 1 lower units 1977-1990

If you are unsure what this means please feel free to ask

OMC Stringer 1966-1977 Propeller Prop Nut Nose Cone Plastic 0373798 0310595 Kit Flywheel but you could always justItem Details OMC Stringer Outdrive Lower Unit Plastic Propeller Cone Nut. Works on 1966 1977 (ALL LOWER UNITS) 120hp,140hp,165hp, 170hp 175,190,225,235 & 245 260 305 350 2. 5L 3. 0L 3. 8L 4. 3L 5. 0L 5. 7L etc Yours should look just like this (please inspect pictures closely for best idea of condition.) Cotter Pin 310595 0310595 Drive Pin 310956 0310956 Propeller Nut 379798 0379798 Purchase with confidence!