Thermostat Housing Kit Fit For Mercruiser Sierra 18-1989 861006A 87290A4

Fits various Mercruiser GM 4.3L, 5.7L, 7.4L and 8.2L applications

Includes inserts, pipe plugs & thermostat gasket

For Sierra 18-1989K gasket service kit

Replaces Mercury 87290A4, 8M0061381, & 861006A1

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