intake manifold water neck

[new2boatingguy]

I have a 1977 175hs omc, I am A auto mechanic and new to repairing boat motors. The what I would call water neck on the intake manifold is corroded beyond saving and I need to replace it. But I am unable to find it on the net, My question is where do I get one or what is the proper term for it in the marine world?:?:

[2850 Bounty]

Identify your engine, and then check this "e-Bay" page (http://motors.shop.ebay.com/_Boat-Parts-Accessories-Gear__omc-thermostat-housing_W0QQ_nkwZomcQ20thermostatQ20housingQQ_fromfsbZQQ_fxdZ1QQ_trksidZm270Q2el1313) occasionally. It will change weekly/daily, but will always bring up OMC thermostat housings since this is a search page.