I have already been through several replacements of the OEM Gel mounts, and I am ready for a final solution while I am doing my headgasket job. I understand that there are solid mounts available, but are these soild mounts rubber, or polyurethane? Perhaps there are both types available (poly and rubber) if so, some feedback from you guys that might have them would be great. Seems like if the solids are Poly, that it may cause alot of engine vibration to enter the car not to mention the "no-give" flex of poly being hard on the drivetrain, though my car is an auto, which may help a bit. The logical choice to me seems to be a solid rubber mount, do you agree? disagree? Thanks guys....