Clip for tailgate panel

Where can I get these clips?

They're from the tailgate panel. Tried the usual places but no luck.

 

That is not the kind of thing I see on my bus trying to hold panels on.

But there are clips like that on more modern cars.. maybe Vauxhall.

 

I have the smaller clips on some holes, the same ones that hold the sliding door panel on for example.

But these ones seem much stronger.

 

Have a look on eBay for stuff like "christmas tree trim clips" or just "trim clips". They're commonly available.