Okay for you DET guys upgrading to stainless:
You need a 12mm Banjo fitting with -4AN male end:
Then you need ~3FT of -4AN line:
Restrictor for Ball bearing GT28 to GT35R: (screws directly into turbo oil inlet, may need -4AN line with 90 degree bend on one end of line to clear exhaust flange)
OR - Restrictor for journal bearing and larger ballbearing turbos (over GT40R): requires additional adapters from -4AN to 1/8" NPT (like pictured below)
1/8" NPT to -4AN adapter, 45 degrees to clear turbo exhaust flange:
This of course is if you use a banjo bolt without a built in restrictor. If you DO buy one from GregV, (it's a Z32 restrictor for a t25, should be fine for t28 non bb), then you don't need the restrictor above. Just the adapter from the turbo oil inlet to a -4AN line.