Check to see if the size hole allows the use of the rubber expansion type ... you still need to clean the surface well... just as you would with brass/aircraft gasket cement ( not saying MB suggests that.. just usual on old cars I worked on )...
The rubber expansion type just needs to be inserted in the clean hole and the bolt in the center tightened.... correct placement is important so you have right about of bulge inside the block area... but they ought to last till spring or summer when mechanicing is more fun....