Mercury Marine 99155A 1 replacement parts

Thermostat 160 Degrees - 18-3555 - Sierra
Your Price: $11.95
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(34% Off $18.33)
Part # 18-3555 ValueShip™ Eligible
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Replaces OEM part #
I have a 1979 228 (4BBL) Mercruiser there is a 142 temp and a 160 degree temp that could fit which one should be used.?
For a 1979 you need the 142, part number 18-3551.
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