Its called a banjo bolt. Im serious that is the name of it....lol
Funny story, went into autozone aked them if they carried banjo bolts, the guy actually told me that the music store was just around the corner. I just bursted out in laughter, turned around and walked away. As I was walking away all the employes were laughing at me like I was the idiot.
Anyway, I had to go the the dealership and order one. I think pep boys might have them in stock, if not pretty sure they can order it. If not go to a parts house that supplies your local mechanics.