It looks like this Part has been superseded by LEGO Part 11153 Slope Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges].
Click on a colored part below to see the Sets and MOCs that use part 61678 Slope Curved 4 x 1 No Studs [Stud Holder with Asymmetric Ridges] 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.