Dave a FS does have a lot of vibration if at all possable epoxy a round piece of wood or dowl into the old hole and redrill a new one for a machine screw and nut, for the engine you have a standard machine head wood screw will work as long as you are not removing it alot if you take it out a couple of times then you will open the hole and the screws will loosen up fast, its a quick way to break a engine mount the front screws tight and the rear loose.