[kstylianos]

Read a recent tech article in Excellence a few months ago...

In the late 70's, Porsche specified that they should be installed "concave side upward' to eliminate engine/chassis vibration. They also mentioned that is this didn't eliminate/help vibrations, then re-mount them as they were (Concave side down so it cups the rubber bushing).

So it dosent look to matter which way they are mounted.