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Hello. My name is Tan.
Could I get your engine serial number please?
Ok let me see what I can do.
Does this look like your T-stat housing?http://www.marineengine.com/parts/mercury_marine_parts/static/img/COMMON/39560.gif
How about this one?http://www.marineengine.com/parts/images/mercury/16413A3.jpg
Mercruisers are cataloged by serial number not model year. So anytime you have questions on your motor you need the serial number.
I'm only guessing on what you have. If you do get the serial number I can help.