When we had wheelhop on our turbo FWD DSM's, and were too cheap to buy poly mounts, we went to Home Depot and bought a tube of 3M windo-weld. You use it to fill the voids in the softa$$ stock rubber mounts. Apply it in thin layers of about 1/4" and allow each layer to dry for about 3hrs(a heat gun may speed this up slightly). Don't be impatient and try to fill the whole thing, it'll never dry on the inside. For best results, fill up and cover the whole rubber mount, making the windo-weld flush with the edge of the mount.....good luck.