Plym 34

I have only recently discovered this informative site, as I am in Australia .I am rebuilding the mechanicals of a 1934 Plymouth , and have difficulty in locating the 3 rubber engine mounts at the rear of the engine - one under the gearbox and the 2 in the upper bell housing area .The pictures on this forum has explained exactly where they are located . 1. Can these upper rubber mounts be fitted with the engine in the car ? 2. Supply of these parts in OZ is very scarce . Can someone recommend a reliable supplier in the US where these parts can be sourced ? Your help will be much appreciated. Regards Richard