It looks like this Part has been superseded by LEGO Part 60583b Brick Special 1 x 1 x 3 with 2 Clips Vertical [Hollow Stud, Open O Clips].
Click on a colored part below to see the Sets and MOCs that use part 60583a Brick Special 1 x 1 x 3 with 2 Clips Vertical [Solid Stud, Thick U Clips] 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.