Toyota radiator grille clip retainer – fits 1st generation Toyota trucks, like my 4Runner. May fit 2nd generation Toyota, I don't know (please leave a comment). Does not fit 3rd gen or later Toyotas.

Pulled a clip from my '87 4Runner and modeled based on that. Works well for me.

Originally uploade to Thingiverse in 2014, I'm re-uploading it here.