The only way to install that same clip is to "deform" it with pliers.
It doesn't have a duty cycle of one. As an engineer, I have zero issues calling it a reusable clip. This same finding is exactly why every kit on the market from Japan, Australia, India, etc doesn't include those.
I'll definitely mention it to our sales team to offer up. We dont want people short parts to finish a project, particularly when it's a part (FACL31007) we have on the shelf by the hundred. It's never made it to our FAQ guide for the same reason but it's easy to add and mention. We are very transparent with photos and descriptions of what is included... we will continue to be that way.
Full disclaimer. I don't know that I've ever had someone feel slighted that wasn't included in 30 years of selling tens of thousands of kits? Your absolutely right our "kit" (or all the others on the market) don't cover ever single part that could be needed. It's legitimately not on the 'top 10' of things we've been told shoulda/coulda been in the kit so I have no plans to add it, rather make sure we add it to the FAQ and sales team education.
The feedback is great and I definitely don't consider it character assassination. Our kits have the same (but Japanese) or more parts than TrailGear/Miku/Karsons/TrailTamer/Driveteq, etc so we all have room to improve in an attempt to cover 100% of the needs 100% of customers may encounter.