Pressure fit mounting box for FM Transmitter chip: https://www.amazon.com/gp/product/B08PVBZB8F/
NOTE: YOU WILL NEED TO REMOVE THE MIC FROM THE BOARD FOR THIS TO FIT
OnShape link if you want to edit: https://cad.onshape.com/documents/de05c248a9c4b200dc03bcef/w/c5786c24369901dbe55d89a3/e/a0ac56d3a2f6660b6fd087f0
The author marked this model as their own original creation.