MerCruiser 71902A1 71902 470 488 190 3.7L 4cyl Front Water Pump Impeller Cover Steering Helm Parts Overall width roughly 7-1/8" &

Overall width roughly 7-1/8" & distance between bolt holes is around 1-5/8"

But NOT MerCarb carburetors with 3" openings

Coils: 580416

and even more expensive than this whole set

MerCruiser 71902A1 71902 470 488 190 3.7L 4cyl Front Water Pump Impeller Cover Steering Helm Parts Overall width roughly 7-1/8" &Item Details Overall Good Condition. Make sure to purchase new gasket set if you're doing this type of installation (Purchase 27 68714A7) Parts Included Impeller Cover 71902A1 71902 Compatibility For the most part it seems these parts were used from 1976 1989 on pretty much all of the 470 models. 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 Alpha One 470 4 cyl 165hp 170hp 180hp 190hp 3. 7L 3. 7LX 224CID 488 485 Sterndrive