I ended up buying 1/2" thick 304 stainless plate (expensive) to make a VNT flange for a VNT 15 turbo I bought. Plate was 12 x 12" and it will make about 6 of these flanges.
I will cut into a triangular shape and cut the center hole only. You can drill the bolt holes and shape it the way you like. If for a VNT 17, I will need to know outlet size for the large hole.
I can sell 5 of these.
$20.00 USD