The headlamp mounting brackets as supplied by Lotus are made from powder coated mild steel.
Unfortunately, they live quite a hard life tucked away behing the wheelarch liners. Quite a lot of dirt, but also road grit reaches the brackets which causes them to rust badly.

To overcome this, we've made exactly the same product in stainless steel. The shape is the same, so you can easily replace the old rusty items for these nice and shiny elise-shop.com brackets.