Ahh!! I have searched for months also. None I have found will fit the OD diameter of the bolt. 5/16 “ a if memory serves. I bought a brass brake fitting from an early Porsche 911 with an ID that has a larger ID than the that bolt and will try to find copper tubing that fits their or is slightly larger OD the sand the tube incrementally until it fits the ID of my banjo fitting. I will then braze it in place, trim any excess that protruded out of the banjo end and hope for the best.. Mart on thi board found an offbeat old Skoda brake banjo that he made function for this purpose. It was in his saved junk pile. Searched for it and had no luck. Good luck let me know if you have any success. The line and fitting manucturers all declined queries for a proper size banjo. Still searching. Let me know..(Lgndlt5). Stalled for now! John