FWIW, using my aftermarket TD06 turbo, my oil return was done real easy. The stock flange on the front cover was simply cut leaving about 1.5 inches of tube. Then a small flare was made and I simply slipped a rubber return hose on it with a band clamp. Simple, dirt cheap and no leaks. It's fine that you had custom flanges and AN fittings done, but that's also expensive (compared to a rubber hose and clamp). However, I can understand if you didn't want to cut any stock pieces up.
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