I use drivers side solid, passenger side stock rubber. Works good with one side note: the small movement that the rubber mount allows causes the solid to loosen slightly over time @ the main stud nut. I’m currently toying with the idea of adding a solid to the pass side simply to stop that issue, simply because it’s a pain to get a wrench to that bolt with my headers. The way it is now, you hardly notice any vibration at all. My car is a fairly mild street / strip deal, not as raucous as most guys here. I use the Moroso steel mounts.