Help please - Boot lock retaining clip

[Stratos Fear]

Thanks Chris - very clear descriptions. As it happens I have one of each of the two types you show, but the one I want to use (beacuse it is stronger) is the Beta Series 1 lock. So , thanks to your help I will look for an X19 clip. I've also made enquiries on the width of the clip used for a LR Discovery which seems to be similar in size.
I remember the Vespa reference (when posted earlier) - but now I know the dimension at 20mm - it is too small.

Thanks to all for your prompt help . Chris if you have a spare X19 26mm clip I'll happily buy it from you ! (the MidWest Bayless item is OOS. - plus the Import Tax and Delivery cost would make for an expensive clip!)

Peter