I don't have a full upper mounter mount to play with that inst on a car. Can the rubber bushing be removed and a poly Sheet/block be cut to size and put in its place? I'm guessing the upper two bolts are molded into the rubber or the rubber molded to the mount? I was thinking of getting a block of poly and cutting it to size to stiffing up the mounter mounts. Any one have an tips or thoughts on this?