hi Mike, the bolt is a m7 fine thread, get it from meteor ford.. there is no need to change the actual selector. Just take your old one off and it will be a case of just tightening it up (adding locktite if you want) if its not damaged, if the bolt is damaged then you can either get a new bolt, put the bolt in out of your spare box or just change the lot over if they are the same.. You do have to lower the gearbox on a jack to get the selector off so dont make the mistake some people do and undo the 4 bolts on the battery tray as they are part of the mounting...