I just stripped the nut/bolt on the rear transmission mount because I didn't have a 1/2 inch 17mm socket on hand, only the 3/8 inch 17mm socket so I used a Standard Size socket that was ALMOST the same size. It was just a tad bit larger. After stripping the nut I went and bought the right socket. It was too late. It could not hold the nut because of the stripping and only stripped it further. As a matter of fact, I then used the correct socket on the front mount and I managed to take it off but only with a breaker bar and noticed that I was stripping that one too but with the correct 1/2 17mm socket. How in the world am I going to take off the ruined one? Someone send me a picture of the tool you would use. It has to be long because I need all the leverage possible because of how tight they are on. If it's a tool similar in size to a 3/8 ratchet then it isn't going to work. My dad loaned me a vice-grip made to turn from the flat sides of the nut only and it was too short so there was not enough leverage/strength to take it off.