Well I finally got in touch with JB Conversions after I went to the parts store. For anyone that wants to know it is a M6 (6mm ?) bolt. They confirmed this and said they would ship me one of theirs right away. Big thank you to JB Conversions for the response. Just ordered my driveshaft from Adams and now looking for a speedo-healer. My speedometer is about 5 to 7 mph off.