If you have ever removed your headlights on a S2 Exige & other models
The nuts rust & when you try to remove them they just unscrew from the plastic light cover 
leaving it in the clam & you have to drill them out or put it back together & leave the problem until next time
These bolts are not available from Lotus & i could not leave it so i made some new ones from HE30 aircraft grade alloy & alloy nuts.So that should cure the rust problem & with anti rattle washers & some cooper slip all should be good now
The above pictures shows how the nut come apart from the unit & below the new parts
