Design ID 58231 is used for ABS parts, and 58181 is used for PC (transparent) parts in Lego cache. Both IDs may be found imprinted on parts at the same time (refer to the photo above). LDD uses ID 58181 for this part.
The following Element IDs have wrong images in Lego cache (images from mold variation 3939): 4498370 (Trans-Black), 4498371 (Trans-Light Blue).
Click on a colored part below to see the Sets and MOCs that use part 58181 Slope 33° 3 x 6 No Inner Walls 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.