Unfortunately, you have to order this clip separately! Business model 🥴. If you search under the term Restube, they should show up. There is only one version of the clips.
In my opinion, the Restube PFD is not suitable for swimming in general. In the river, I would not recommend the Restube for swimming. It has no predetermined breaking points. I use the Restube for SUP and kayaking. There it is ideal but does not replace a full protective waistcoat in difficult conditions.