These are modified versions of the Kreg NZ03-B Drawer Mounting Brackets. The ones I bought were warped. The ones you print will be flat.

To see my full review of the Kreg NZ03-b and why I had to go through the trouble of modeling/printing my own, check out the full blog post at http://tool-torials.com/028-kreg-nz03-b-drawer-mounting-brackets-review