I just found a rear starboard side mount broken (at least one of the bolts). I have a 2004 Westerbeke B3 and as soon as I haul out in three weeks I wilkl replace all four since the other three are pretty much rusted. The replacement mounts from Westerbeke are over $200.00 each! I found a company, Torresen Marine, Inc which makes mounts for this engine for $48.00! You also can see how to change them through a great video that you will find at: www.pbase.com/mainecruising/motor_mounts
. Good luck. By the way it is better to rep[lace all four instead of just one if they are more than two-three years old.