I think all of the small Yanmar engines use the
same mounts. The replacement mounts I have are equipped with the same size stud (length too) and same thread pitch. The body's are much smaller. I needed smaller to get my revised hydraulic pump mount installed. The only reasons for using a certain mount is the compliance of the rubber and the weight and torque of the load. In other words, will it give the desired cushiness or if in a race car, give the needed characteristics of the sport (race) that the car is used in. In a sailboat, well, not too many parameters come to my mind. You don't want too much rust. You want the engine to stay were you put it. You want it quiet and you need them to last. A FAIR price doesn't hurt either. These guys fill the bill for me. I JUST DUG OUT MY INVOICE. They did come from Marine Partsfinders, 618 US Hwy #1 STE 306, North Palm Beach FL. 33408. No phone # shown. The part # for the mounts is BAR80001. My cost was $22.60 each. (total 90.40) With $10.95 freight the total was $101.35. That was on 7/10/00. Should be the same price today. (nearly) Sure beats Yanmar. And these work great. Oh, they are fully adjustable as the Yanmar mounts but because they have a smaller base, you will need one new hole for each mount, in your angle iron beams. The steel is soft, Makita worked for me.

Man, I am doing all the work this morning;http://www.marineparts.com/partspages/ENGINE/ENGINE1.HTM