coupling bolts


I have a 1998 Amel 53 Supermaramu and discovered that one of the 4 coupling bolts that attach the engine outdrive to the transmission has broken off.  I believe this was probably caused by engine/transmission malalignment, but not sure.  Meantime, I tried to see if there was an easy way to install a new bolt, but do not see a way to do so.  Any assistance would be appreciated.

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