4G56? The inlet interior diameter and bolt positioning looks close to the 4D56. I'm in the process of mocking up an inlet flange to open-source the file. If you still haven't found your manifold inlet, I'll send you the flange .step file and you can have the piece cut and welded pretty easily. Or if that's a hard plastic (I honestly can't tell) I'll show ya where to get it 3D printed.