Turns out the clips are too long for shells, so they stick out, this is also true of Leo's model. Good news is, putting two of these in the same slot is a tight enough fit that you can just snip off the bit sticking out and the bars will still stay in place. This isn't viable for drawers more than 2 wide, however, that would require a similarly modified center piece. [UPDATE: `Drawer Stopper Extender Bar Clip.stl` now available as well.]