This one has a poly bushing in between that twists as the engine rocks but limits to lateral twisting instead of the rubber which may allow forward and aft. If I were staying stock and wanted to increase stiffness, an old racers trick is to fill with window weld or urethane from a tube to fill the gap. More vibes and not quite solid. You can even find different compound urethane that may fit your needs.Did you come across any poly options for the engine mounts? Mine will need replacing soon and I dont really want to go solid...