Here is the style of Banjo Bolt that Detomaso used, but I haven't found; notice the step at the top, the top uses something like an M14 washer but the thread is M12 (or 3/8-24, I think, for all the brakes).
I ended up replacing the unions at the caliper and on the Master Cylinder and used more standard (3/8-24 or M12) bolts--Lee
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