Get any numbers that are embossed on the lights and put them into a search engine on line and see what comes up.
Expanding Millie masters point, even expensive vehicles share parts. Loads of Porsche parts can also be found on VW cars. My "VW" has many parts that are Mercedes, many parts will also be found on other VWs, Seats, Audis and Skoda's.
Any headlights that are square like that are pretty generic. Same as the indicator. I would be inclined to take the measurements of the lights and got to a local scrapyard. You could wander around and see what may be suitable donors. Also most scrapyards have got boxes and boxes of lights ready. Show them what you have and ask them to check for similar or if you can take a look through yourself.
PS. are those beam deflectors on there because they are LHD Headlights or just from some previous continental trip? I'd get rid of those! (And if they are LHD lights possibly, I think they have to be changed anyway for a UK MOT?)