Shakespeare used to do a flip up trout net with that clip, one of the reasons I bought one although the rivets pulled out on mine and I ended up binding it back on with plastic coated garden wire, over-glued and then insulation taped over the top so I wouldn't put too much faith in a riveting process.
Might be worth contacting them to see if they will tell you where the clip originates from?
Edited to add: With hindsight I would just find and cut a heavier strip of metal, place it in a vice and bend to required shape before drilling out corresponding holes in clip and landing net pole and then bolt straight through as opposed to comparatively weaker rivets.