There are two known mold versions of this part:
2453a Brick 1 x 1 x 5 with Blocked Open Stud
This is the original version, introduced in 1988. The single top stud is open but blocked.
2453b Brick 1 x 1 x 5 with Solid Stud
This is the modern version, introduced in 2010. The single top stud is solid.
The mold comparison image shows both versions. If unsure, use the modern version 2453b.
Click on a colored part below to see the Sets and MOCs that use part 2453a Brick 1 x 1 x 5 with Blocked Open Stud 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.