A simple adapter plate for the smaller 50x60mm Mosfet boards. Fits over top of the bolt attachment posts designed into the MKS-Gen L electronics box made by mo78.
In the photos above I have attached the two boards using only 2 screws each that are longer than necessary as I have run out of small M3 bolts. While 2 is certainly enough to hold the boards in place I'd recommend using 4x M3x8 or M3x10 bolts to attach each board, and then 4x M3x10 bolts to attach the adapter to the attachment posts.
MG Chemicals PETG