How do you change a ROUND headlight to a 89 Jaguar XJ6?

To change a round headlight on a 1989 Jaguar XJ6, first, ensure the vehicle is turned off and the headlights are cool. Remove the retaining ring by unscrewing the clips or screws securing it, then gently pull the headlight assembly out. Disconnect the wiring harness from the back of the headlight and replace it with the new one, ensuring it's properly seated. Finally, reattach the retaining ring and test the new headlight before closing the hood.