I haven't pursued it any further . I'm waiting on my turbo to be built ...a few more weeks . I guess I'll just measure the old ones . I figured someone on here would know .
The studs on the headers to turbo .
Nut Specs: Flange Grade 8 Hex Nuts M10 x 1.50 Serrated Lock Style. Bolt Thread Pitch: M10 x 1.50. Threaded Side Into Flange: 12mm. Total Height on Nut Side: 30mm. Stud Total Length: 42mm.
I'm getting one built as well be several weeks for mine also.
I bought nuts on my 3 bolt Pte turbo that thread pitch I thought was 1.5 . sorry I couldn't help. I thought your were talking about the turbine bolts. Ok I see the other fella help you out... Good deal