Desk Keyboard Draw Bracket

I have been slowly reverse engineering my desk pieces I have gotten from the local hardware store. These pieces I have had to get creative with to work with store bought versions. I have been learning 3D modelling for about 2 weeks now with wild success. This is really fun, new and exciting for me.I have 4 of these units printed on all 4 corners of my under desk MIDI keyboard draw with successful installation. These holes being suitable for my draw slide but not sure if it is universal so please do measure.