simyamaha.com for Yamaha parts. For alternatives, search for camp zincs, they make the majority of zincs for us manufactures (OEM for Mercury). Make sure you get the correct zinc. Some Yamaha zincs have a little scoop on the leading edge that draws water in, feeds it back thru the exhaust housing and helps cool the exhaust. It will burn out a prop hub if you don't have it. If you have the lower unit dropped, you'll see the tube that runs from the trim tab cavity back to the exhaust outlet(not all yamahas have this). Get the oem bolt, its a special bolt(smaller head so your socket will fit thru the hole)
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