F5-85 F5 Wheel Center Cap Serial Number F5-85-CAP F5 Wheel Center Cap for model F5-85 OEM replacement center cap with serial number F5-85-CAP (see back of cap to match numbers). **Note: If the numbers do not match the cap, it will not fit your wheel! Chrome Plastic Back of cap measures 6 3/4" in diameter Scroll down to Product Description for further fitting help or go to our FAQ on our store site.