Part Number: 911.631.111.00 Bosch H1 headlight lens with the BOSCH logo engraved in the inside of the lens. This lens is hard to find and not like the H1 lens available everywhere else. If you're looking for the correct H1 lens this is it. H1 headlights were a special-order option from the Porsche factory starting in the late 60's. Please call us with any questions.