It looks like this Part has been superseded by LEGO Part 57909b Technic Brick Modified 2 x 2 with Ball and Axle Hole, with 6 Holes in Ball.
Click on a colored part below to see the Sets and MOCs that use part 57909a Technic Brick Modified 2 x 2 with Solid Ball and Axle Hole in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.