Serrated Bit!
Napa has them and the # you should tell them is SER2305.That should be the 10 mm bit size.Good luck.Be careful not to strip the bolt when removing.Soak with penetrating oil(not wd 40). Clean out the insert hole very well,then insert bit,put the bit in a socket and a short extension on that(an old one you don't care about)hit bit with a small hammer several times to shock the bolt.If the bolt head feels as if it will strip out or feels stuck heat is the only way to extract them without destoying the bolt(use an acetylene torch).Good luck!
Napa has them and the # you should tell them is SER2305.That should be the 10 mm bit size.Good luck.Be careful not to strip the bolt when removing.Soak with penetrating oil(not wd 40). Clean out the insert hole very well,then insert bit,put the bit in a socket and a short extension on that(an old one you don't care about)hit bit with a small hammer several times to shock the bolt.If the bolt head feels as if it will strip out or feels stuck heat is the only way to extract them without destoying the bolt(use an acetylene torch).Good luck!