I have vibratechnics mounts in my mk1 Orion. Of course different to mk4 escorts, but they create wuite much noise at 4000-5000rpm. Some kind of chassis resonance propably. Well worth the money anyhow as the Ford mounts are more expensive and I've teared enough of them to peaces.

BTW, Deflex now does polyurethane S2 engine mounts for 9£ each!