Parts needed: ¼ Inch threaded rod

                         ¼ Inch nuts 

                        M3 threaded inserts

                        M3 screws

Main/extended io board mount compatibility: 

Original io board: https://www.waveshare.com/compute-module-4-io-board.htm 

Waveshare poe board: https://www.waveshare.com/compute-module-4-poe-board.htm

Worker node board compatibility:

Waveshare mini base board A: https://www.waveshare.com/cm4-io-base-a.htm 

Waveshare mini base board C: https://www.waveshare.com/cm4-io-base-c.htm 

Waveshare mini base board B: https://www.waveshare.com/product/cm4-io-base-b.htm 

I will be adding more to this soon (: