Does anyone know the best source for these. What I am talking about are the metal clips which are attached to the back of the plastic interior pieces, which snap into place. For example, if you remove the little caps on each side of the rear bar in the hatch, there are a couple there.

Are these standard, or do I need OEM?

 

I think I have seen them at Lowe's. They have a drawer there with automotive fasteners. I would try there.