Well I bought 10 of the DZUS fasteners with the black button head (the type a 4mm allen wrench is used with).
Unfortunately, I'll be returning them.
They're considerably smaller than the factory screws. A 4mm allen wrench is used with them. And with both being so small, they're difficult to use. I had to drill the holes they fit thru very slightly. They also seem slightly too short. The D-ring type is probably easier to use since you have more to grab onto. But I wanted abit cleaner look.
This is really disappointing. I've been wanting these for years.