polymaker petg dark grey, just a little too light. Bambu lab petg-cf titan gray, just a little too dark. thats the closest filament i have seen. think polymaker petg dark grey with a slight fuzzy skin added would look good. but not tested yet. google X2D color match filament, you find a reddit post on this with pictures
The AMS mounts are tinmorry PETG-CF dark gray. Sorry, I should have uploaded this in my original comment lol. It’s an H2C, but the x2d and the H2C are the same color. I’ll grab a better pic later of the same part next to my x2d.
If PETG is too light you can add a wall to make it darker. So if the one that is too light was printed with 2 Walls, make it 3. Usually does the trick. In short, the third wall reduces the amount of light passing through the outer shell to the infill gaps, which can make the solid color appear deeper and richer. It’s all about removing some translucency**.**