Review on Black Wheel Center IBIZA 6LL601171 by Steve Yatnalkar

They usually insert into the wheels, not very strong, they rattle a little but they will do it. Very hard to find. Top Tip - Drill a small (2mm?) hole about 10mm from the edge of the center cap. So you can use a pick, bent wire, or allen wrench to pull them back out without removing the wheel.