There have been several minor changes of the underside - refer to the second photo below.
Lego mapping includes design ID 30244 for transparent (PC) parts, 51815 and 15561 for Metallic Silver version.
Click on a colored part below to see the Sets and MOCs that use part 2412b Tile Special 1 x 2 Grille with Bottom Groove in that color. You can find an overview of all LEGO Colors here.
This part has been used by MOCs in the following colors but not officially released.
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