Head Lamp Protectors

My Disco 2 has headlamp protectors fitted (part no. STC50026). I now need to remove the nearside one to gain access to the indicator assembly but find that the two screws on the side are rusted up and the posts rotate. Getting them out isn't my concern but does anyone know where I can get replacement posts and screws without having to pay £40 or £50 for a complete new headlamp protector kit?

Managed to get one brand new nearside headlamp guard and fixings off E-Bay for £20 so that's just dandy.