I'm at a loss to understand how you use a db-9
connector w/a db-25 hood. The$
I've yet to see D-shell connector hoods that care about pin count; they
all just care about size, so a DB hood is a DB hood, regardless of
whether it's a DB-25, a 13W3, or even something really esoteric like a
DB-9. (I've never seen a DB-9, though I've seen a recent trend to try
to apply the term to a DB-25 with only 9 pins installed, for some
reason. Perhaps oddly, I've never seen the other logical consequences
of that point of view, such as calling a DB-25 with only pins 2/3/7
installed a "DB-3"....)
What you most likely want is a DE hood. Almost all of what is called
"DB-9" is actually DE-9, misnamed by someone who doesn't understand the
terminology. (Unfortunately, this includes far too many vendors.
Sturgeon's Law applies.)
As for grommets? I don't know of any designed for the purpose. But
there is a very wide variety of grommets out there designed for
sheet-metal use; it would not surprise me if one of them would serve
your purpose.
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