Driveshaft bolt for BTR differentials and output flanges. This bolt fits both the differential output flange and the hub. This high tensile strength cap head bolt is 60mm long. There is a shorter version TVR R0042 SH which is 50mm long. This 60mm bolt is meant to fit all later cars with BTR differentials but please check lengths on your car!!! This bolt must be high tensile due to application and these are 12.9 rated.