GW-145 Golden Wheel Center Cap Serial Number GW145-CAP Golden Wheel Center Cap for model GW-145 OEM replacement center cap with serial number GW145-CAP. (see back of cap to match numbers). **Note: If the numbers do not match the cap, it will not fit your wheel! Back of cap measures 7" in diameter Chrome plastic Scroll down to Product Description for further fitting help or go to our FAQ on our store site.