Roof rack cap issues?

Also, this may have been asked a million times before - send me to thread if it has. What's up with the roof rack caps??? So cheap and every one we looked at before purchase had the same issue. We are missing one now and need to replace. Seems like this is a design flaw?

 

They are not cheap and every time I find a wrecked or parted out 4Runner they are usually the first thing to go. I have been missing one forever. I am in need of the Drivers side rear cover if you find one and let me know which one you are missing and I shall return the favor.

 

That's a deal! I'm missing the rear passenger. Let's work together on this!

 

I actually have the right cap for mine..... but clips are missing. I'm toying around with ideas of how to place it there with adhesive or something. I think these caps were a major design flaw.... while looking at 4runners for my daughter all of them had cracked or missing caps.