I guess I just assumed that ALL the stock covers, cowlings, drains, bits and bobs are in place and not broken....
BMW Parts Catalog
or getbmwparts.com,
or
https://parts.bmwofsouthatlanta.com/
GL
(That area is designed to get wet- in general everything under the hood is... so if just a little water causes you issues I wonder if something else is going on with a open module, damaged seal, etc...)