R & D Marine Small Compression Engine Mounts. The R & D Small Compression Mount is a competitive, low height, medium capacity compression mount giving good engine control. Designed for marine use, accepts propeller and engine thrust in both directions. Offers a fail safe design R & D Mounts are height adjustable Slotted holes in base to assist in alignment Mount types to fit all applications The R & D 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 and pasivated to limit corrosion. The rubber component is covered by an oil shield to protect it from petroleum based products.