I wanted to be able to attach tool holders to LeIN's stackable drawer top plate, so threw together this (very) rough model. It's not the cleanest, but it's functional and that's good enough for me.

The holes in the back plate fit M2 bolts, and are 20mm apart. As you can see in the photos, I added holes to a plier holder that was originally designed for your basic pegboard, and attached it with bolts and nuts. 

Many thanks to LeIN whom designed an excellent modular set of drawers and uploading the STEP files!