I had my car in the shop to get my pinion bearings replaced yesterday. While it was there the guy was gonna throw the tranny mount on for me too. But he said its the wrong mount. The bolt on the mount is 12mm, and the bolt on the old mount was 10mm. Also he said the 1LE mount is missing a rubber flap that helps stop vibration. I ordered the mount directly from SLP. However it does have a GM part number on it. Did i get the wrong mount?