19, 5 arm. 19, type 2. 19, type 1. 18, type 3. 20, type 2. 20, five arm. 21, five arm. 20, arm type. 18, 5 arm, with code cc1. 16 & 17, 17 wheel, type 2. 17 & 18, with 18 wheel, with type 2 10 slot wheel. Ensure that your audi wheel stays sharp with these replacement center wheel caps. The center caps on your wheels keep the clean and smooth look while proudly displaying the audi rings logo- so be sure to replace your missing or damaged center cap.