Don't forget to thoroughly clean and use the appropriate primer for the urethane. Without it, the urethane will not bond to the rubber on the mount. A buddy filled his mount with urethane without using the primer and it separated after a few thousand miles.
We ended up installing the updated version of the mount (987 part number). It's more durable than the stock one and at < $140, there's no reason to fuss with the urethane at all.
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