MS 24694 are flush type structural screws and are available in
stainless (MS 24694C). Spruce, Chief, Wicks, and many others have
them.

That may well be true but when I spoke to D&D supply a couple of years ago they
told me that the stainless flush screws were not strong enough for the
application and they would not sell them in thier Piper fuel tank kits. I
suppose that lots of things can change in two years. I will call them tomorrow
and ask again.

John Dupre'