Hinged petrol cap, "winged turn lock" (Westwood) type. A new reproduction hinged, petrol cap (fuel cap) with winged turn lock for 2 7/16" (approx 62mm) openings. Very well made. Suits BSA models A50/A65 68-8083; Royal Enfield , Matchless, AMC, Norton Original Part Numbers: 68-8083 - BSA models A50/A65 03-3001 - AMC part number - P11, P11A & 1968 G15CSR