Mounting plate for Meanwell RS-15-5 and 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/268a049e4c4791a589ec5cff/w/09d69db34f7b1719be69fcba/e/1a51e607cc54fb9d87c87361
Link for just the FM box: https://www.printables.com/model/738951-mounting-box-for-fm-transmitter-chip
The author marked this model as their own original creation.