A few weeks or months back there were some threads discussing the fittings to install a stainless turbo oil feed line. I recently found the turbo fitting for -4AN to stock 12 mm banjo. It is made by Goodridge. I called Summit and got them to add it to their parts lists. Last I checked it was still not online, but I was able to order it from them. Part number GDR-77612. $10.39. Watch out for that $8.95 handling charge though if that is all you are going to order. Mine arrived yesterday, and it fits perfectly.
SBR has them too, but they want $20 for it.
SBR has them too, but they want $20 for it.
