Though I'm sure there are suppliers for these banjo fittings, I know they are a similar size to many of the hard-line banjos used on various parts of Bosch fuel systems. I scavenged one which I used for the top of my wastegate. If I recall correctly it either came from the output end of a Bosch fuel pump, or around the fuel head on a VW jetta. Used the same bolt thread too.
Jim
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