Alright, just got my camera back. I have taken some photos to show what I need.
I need a spring pin to fit on this. I have tried 24mmx1.5mm but it does not fit (on the middle part)
The other part that I need is the allen screw that holds the strap as you can see on the next photo that it is missing.
This is my Navitimer which I really like. It looks big on my wrist but i dont care.