Bricker - Part LEGO - 18978a Wheel Cover 5 Spoke - for Wheel 18976
BrickLink - Part 37195 : LEGO Wheel Cover 28 Spoke - 18mm D. - for Wheel 56145 [Wheel, Accessory] - BrickLink Reference Catalog
BrickLink - Part 54087c02 : LEGO Wheel 30.4mm D. x 20mm with No Pin Holes with Black Tire 43.2 x 22 ZR and Pearl Light Gray Wheel Cover 5 Spoke without Center