There are 2 version of Neckwear Bracket [One Stud].
The main difference is that the vertical side. 42446 is 3 LDU, 28974 is 4 LDU.
C in the image is a 36841 to comparison.
Thanks to NewElementary.com for the info and comparison image.
Click on a colored part below to see the Sets and MOCs that use part 28974 Neckwear Bracket [One Stud] - Reinforced 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.