This is a mount that I bought Nov 2013 that was damaged in a rollover accident and is therefore covered in ATF, etc. (see damaged safety pin area ... it ripped out in the wreck) Weeks ago, I bought another and installed it in my current 99 GTP. Its the same part number and brand, sourced from the same store (O'Reilly's). Both are solid. I just jammed a pocket screwdriver through the center of this one to confirm, and no fluid escaped. Vendor's websites states materials as steel and rubber. Its a good mount, cost me $55.
