THIS IS A GENUINE LUCAS RER25 AMBER REFLECTOR, IT HAS A CHROME RIM, MOUNTING RUBBER, AND A CHOICE OF CENTRAL FIXING SCREWS. OVERALL DIAMETER IS 2" AND REFLECTOR DIAMETER IS 1 1/2" . IT IS A MODERN LUCAS PRODUCTION OF THE ORIGINAL LENS AND IS EXCELLENT QUALITY MADE TO BS 2515 STANDARD.