RSW-33 RED SPORT Wheel Center Cap Serial Number CSRSW33-1P RED SPORT Wheel Replacement Center Cap for model RSW-33 OEM Wheel Replacement Center Cap with serial number CSRSW33-1P (see back of cap to match number). **Note: If the numbers do not match the cap, it will not fit your wheel! Back of cap measures 7 1/4" in diameter Chrome plastic Scroll down to Product Description for further fitting help or go to our FAQ on our store site.