Updated as I have time to take some pics.
These are the endlinks before installation.
Left = Front
Right = Back
The back is "winged" to keep the endlinks in place.
Notice that after the endlinks is placed, there is a gap of around 2mm until the spring bar hole.
Spring bar is installed. You can see that the gap is there for leather strap or nato.
I have yet to get a nice leather strap to match this watch so I am using the endlinks on nato.
After slipping in the nato, the endlinks won't move and fits snugly.
Customary wristshot.
My overall thoughts on the endlinks is that they are really well made.
Solid piece of stainless steel and fits like a glove.
Virtually no play once installed... tell alot about the care that they take to manufacture these.
Word is that these endlinks were in demand for the Daytona models as the Rolex Leather strap Daytona models come with a similar look.
I have yet to fit the set on my GMTIIc but it should look pretty cool if I were to wear it on leather strap.
Here is a pic borrowed from the net.