I wonder how that happened
For me the really question would not be if the boat is still usable (which it is), but how that damage happened, and what other (unseen) damage has occurred. For that lateral support to be broken off, the drive must have taken quite a hit from the side, and that would also translate to damage and possible alignment problems further up the drive and, possibly, into the gimbal housing.... Get an EXPERIENCED Merc certified tech to have a close look at it...
Chris.......