I wanted a fairly cheap and cheerful way of replacing the headlight lenses on my coupe without having to replace the headlights themselves, as they had become cloudy / hazy and had started to crack. GSF are selling lenses (part numbers 948BM0090 and 948BM0100) for £30 each but for some reason, the website says they don't fit my car...but they do! I used the following as a guide and all went well:
Replacing headlight lenses - CSL Register
Unfortunately the old lenses in the first two pictures don't show the hazing anywhere near as much as the naked eye. Last picture is a new lens.