Not to sound too ghetto or anything, may as well try this first: I used the black hard rubber silicone window sealant that you can buy at autozone, discount etc. Bout 5 bux. Hollowed out the mount of all liquid, and filled it with the silicone, also added to the exterior structure some.

Just let it dry over night, had mine in unbroken for quite a while, all kinds of abuse thrown at it. It finally cracked open when I let the motor sag for almost a whole day while changing the tranny out . But you'd better believe that I'm filling it again before I buy another.