IKEA Alex drawer bins, need help with modifications.

Problem: \- 40mm grid size fits perfectly \- 40mm is not standard as anything from others wont fit \- using generators to make bins/baseplates but like what other users are making

Solution? \- edit bin slightly to allow for 42mm grid size? \- edit each STL i like for a 40mm base? (how the hell would I do this)

right now this is pretty jank and I have 2 cradles like this with a flat bottom. (i dont know how to do it other wise) Does any one have any ideas that could work?