I am looking for a set of blank centercaps like these for my wheels. does anyone know where i can get them?

 

That could be a rota center cap painted black.

 

definetly looks like a painted rota centercap.

I did the same thing to my caps on my old rotas. I sanded them down and sprayed 4 light coats of satinblack paint on them, waited about 20 minutes in between coats... came out great