Fits:  -Engine mounts on 65-89 911, all 930 -915 and G50 Transmission mounts 72-89 911, 912E Manufactured from a modern high performance and high temperature polyurethane, making these  semi-solid engine mounts the perfect compromise between stock rubber and solid mounts.  The rigid  polyurethane construction makes them ideal for performance oriented cars but still allows absorption of  harmful vibrations and noise associated with solid mounts. Installs in stock motor mount hangers  replacing worn out factory rubber.  These also replace Transmission mounts on 915 and G50 equipped  cars. HD mounts are 10% more rigid than OEM, the  "Sport" mounts are 30% more rigid than the  HD mounts (40% more than stock).  Sold in pairs.