I'm missing the above clip, thanks to the pictures of Mick and Rik I made the following drawing.
Can someone that actually has such a clip confirm the shape and add dimensions?
I'll have a look for you. I should have a spare one (NOS) somewhere.
Will take a few weeks as I am quite busy preparing for Oost-Vleteren (WW1-display) this coming weekend, Wageningen (Canadian WW2 display with my Norton and Welbike) on May 5th, and Oirschot the following weekend for the Dutch Army open days (doing Prinses Irebne Brigade).