Motor mounts (biscuit type)

Quite a while back someone posted info about some motor mounts (early biscuit type) that had a bolt through them or some sort of lock so they don't break.

I've tried Schumacher's poly mounts and my 408 tore them up in 5k miles so for now I have solid mounts on it. It doesn't vibrate bad but I can feel the pulses from the solid's.

Does anyone know what mounts I'm talking about that are rubber with a bolt through them? I've searched and can't find info on them now