kys911T
It's strongly recommended that NO WATER be poured on your E-9 by any hose, garden or otherwise. From a firehouse, there could be enough water delivered to go through the tiny screw holes you are expressing concern over, but who would do that?
And IMHO--only a thoughtless owner would risk his coupes health by driving in SoCal in the rain as there are some real doofus drivers out there with no concept of the dynamics of wet weather driving.
My comments are believed good coupe practices based on nearly 40 years of ownership and 500,000+ miles of coupe seat time and E-9 preservation.
BTW--the front badge is called a roundel and the current method--for the last 15 or so years--of attachment is similar in appearance to a hat--get them from Mesa Performance in Costa Mesa. If you have any early steel spring clip fasteners of the early type mentioned by stevehose--throw them in the junk--they are guaranteed to damage the mounting pins of your roundels.