I only need one new one, what the teacher suggested isn't necessarily a "cheap fix". He suggested it to me because my car has 3 tranny mounts and one motor mount. All of the mounts but one has about 16,000 miles on them and they all are in stock form very weak. He said that adding that urethane into them will not only make them last longer but will tighten up the torque to the ground and the shift linkage vibration.