I used these guys.
http://www.marineparts.com/partspages/table.htmThe deal is that the mounts are not Yanmar. I ordered mounts that would fit. They even have the same stud size and hight. The difference is in price. The Yanmars run close to $500 for a set of four. These were $90 for all four in 2000. They work great! Here's a peek,