RE: HELP! Engine Mounting Problem!
Realised you were referring to the mount to firewall bolts. Use ones that will sit fully in the threaded section of the blind nut or protruding a couple of millimetres. Just use some spring washers on top of a normal washer. You won't have any problems with these loosening up. Just check by holding engine and twist slightly. If loose, tighten.
Regards
Mark.