R & D Engine Mount w/6.85" Footprint - 5/8" Stud - 50-175lbs Capacity Per Mount (Yanmar*)Engine Mount w 6. 85" Footprint 5 8" Stud 50 75lbs Capacity Per Mount *Suitable for the Yanmar 1GM, 2GM, 3GM, 3YM, 3HM and 3JH series engines The R & D Marine Engine Mounts are designed specifically for the rigors of marine applications. The mounts are stiff enough to absorb forward and reverse propeller thrust, yet soft enough to isolate drivetrain vibrations from the hull. To help increase the longevity of the mounts, all steel parts are zinc plated