LEGO’s Pick-a-Brick service has only a limited amount of the total range of pieces ever produced. It contains a subset of the pieces available in current sets.
The Bricks and Pieces service (on the LEGO website under Customer Service) has a slightly larger range of pieces, but still limited to those that are currently produced by LEGO. This service is ...
Could not find it by typing numbers (15068 bricklink id or 605109 lego id)
but simply browsing it is simple enough to find.
Open the 7th category of bricks, 4th element:
I'm using the latest ldd version (4.3.11)